< /ˈbeɪ siz/.

  1. the bottom or base of anything; the part on which something stands or rests.
  2. anything upon which something is based; fundamental principle; groundwork.
  3. the principal constituent; fundamental ingredient.
  4. a basic fact, amount, standard, etc., used in making computations, reaching conclusions, or the like: The nurse is paid on an hourly basis. He was chosen on the basis of his college grades.
  5. Mathematics. a set of linearly independent elements of a given vector space having the property that every element of the space can be written as a linear combination of the elements of the set.

adjective, bas·er, bas·est.

  1. morally low; without estimable personal qualities; dishonorable; meanspirited; selfish; cowardly.
  2. of little or no value; worthless: hastily composed of base materials.
  3. debased or counterfeit: an attempt to eliminate the base coinage.
  4. characteristic of or befitting an inferior person or thing.
  5. of illegitimate birth.
  6. not classical or refined: base language.
  7. Old English Law. held by tenure less than freehold in return for a service viewed as somewhat demeaning to the tenant.
  8. Archaic.
    1. of humble origin or station.
    2. of small height.
    3. low in place, position, or degree: base servitude.
  9. Obsolete. deep or grave in sound; bass: the base tones of a piano.


  1. Music Obsolete. bass1(defs 3, 4).

noun Surveying, Navigation.

  1. a technique for establishing the distance between any two points, or the relative position of two or more points, by using such points as vertices of a triangle or series of triangles, such that each triangle has a side of known or measurable length (base or base line) that permits the size of the angles of the triangle and the length of its other two sides to be established by observations taken either upon or from the two ends of the base line.
  2. the triangles thus formed and measured.


  1. the plural of basis


  1. the plural of base 1


  1. a method of surveying in which an area is divided into triangles, one side (the base line) and all angles of which are measured and the lengths of the other lines calculated trigonometrically
  2. the network of triangles so formed
  3. the fixing of an unknown point, as in navigation, by making it one vertex of a triangle, the other two being known
  4. chess a key manoeuvre in the endgame in which the king moves thrice in a triangular path to leave the opposing king with the move and at a disadvantage


  1. the bottom or supporting part of anything
  2. the fundamental or underlying principle or part, as of an idea, system, or organization; basis
    1. a centre of operations, organization, or supplythe climbers made a base at 8000 feet
    2. (as modifier)base camp
  3. a centre from which military activities are coordinated
  4. anything from which a process, as of measurement, action, or thought, is or may be begun; starting pointthe new discovery became the base for further research
  5. the main ingredient of a mixtureto use rice as a base in cookery
  6. a chemical compound that combines with an acid to form a salt and water. A solution of a base in water turns litmus paper blue, produces hydroxyl ions, and has a pH greater than 7. Bases are metal oxides or hydroxides or aminesSee also Lewis base
  7. biochem any of the nitrogen-containing constituents of nucleic acids: adenine, thymine (in DNA), uracil (in RNA), guanine, or cytosine
  8. a medium such as oil or water in which the pigment is dispersed in paints, inks, etc; vehicle
  9. the inorganic material on which the dye is absorbed in lake pigments; carrier
  10. biology
    1. the part of an organ nearest to its point of attachment
    2. the point of attachment of an organ or part
  11. the bottommost layer or part of anything
  12. architect
    1. the lowest division of a building or structure
    2. the lower part of a column or pier
  13. another word for baseline (def. 2)
  14. the lower side or face of a geometric construction
  15. maths
    1. the number of distinct single-digit numbers in a counting system, and so the number represented as 10 in a place-value systemthe binary system has two digits, 0 and 1, and 10 to base two represents 2 See place-value
    2. (of a logarithm or exponential) the number whose powers are expressedsince 1000 = 10³, the logarithm of 1000 to base 10 is 3
    3. (of a mathematical structure) a substructure from which the given system can be generated
    4. the initial instance from which a generalization is proven by mathematical induction
  16. Also called: base clause logic maths the initial element of a recursive definition, that defines the first element of the infinite sequence generated thereby
  17. linguistics
    1. a root or stem
    2. See base component
  18. electronics the region in a transistor between the emitter and collector
  19. photog the glass, paper, or cellulose-ester film that supports the sensitized emulsion with which it is coated
  20. heraldry the lower part of the shield
  21. jewellery the quality factor used in pricing natural pearls
  22. a starting or finishing point in any of various games
  23. baseball any of the four corners of the diamond, which runners have to reach in order to score
  24. the main source of a certain commodity or elementa customer base; their fan base
  25. get to first base US and Canadian informal to accomplish the first stage in a project or a series of objectives
  26. off base US and Canadian informal wrong or badly mistaken
  27. touch base to make contact


  1. (tr foll by on or upon) to use as a basis (for); found (on)your criticisms are based on ignorance
  2. (often foll by at or in) to station, post, or place (a person or oneself)


  1. devoid of honour or morality; ignoble; contemptible
  2. of inferior quality or value
  3. debased; alloyed; counterfeitbase currency
  4. English history
    1. (of land tenure) held by villein or other ignoble service
    2. holding land by villein or other ignoble service
  5. archaic born of humble parents; plebeian
  6. archaic illegitimate

adjective, noun

  1. music an obsolete spelling of bass 1

noun plural -ses (-siːz)

  1. something that underlies, supports, or is essential to something else, esp an abstract idea
  2. a principle on which something depends or from which something has issued
  3. maths (of a vector space) a maximal set of linearly independent vectors, in terms of which all the elements of the space are uniquely expressible, and the number of which is the dimension of the spacethe vectors x, y and z form a basis of the 3-dimensional space all members of which can be written as a x + b y + c z

1818, from Medieval Latin triangulationem (mid-12c., nominative triangulatio), noun of action from Latin *triangulare, from triangulum (see triangle).


“to place on a foundation,” 1841, from base (n.). Related: Based; basing.


“bottom, foundation, pedestal,” early 14c., from Old French bas “depth” (12c.), from Latin basis “foundation,” from Greek basis “step, pedestal,” from bainein “to step” (see come). The military sense is from 1860. The chemical sense (1810) was introduced in French 1754 by French chemist Guillaume-François Rouelle (1703-1770). Sporting sense of “starting point” ia from 1690s, also “destination of a runner” (1812). As a “safe” spot in a tag-like game, suggested from mid-15c. (as the name of the game later called prisoner’s base).


late 14c., “low, of little height,” from Old French bas “low, lowly, mean,” from Late Latin bassus “thick, stumpy, low” (used only as a cognomen in classical Latin, humilis being there the usual word for “low in stature or position”), possibly from Oscan, or Celtic, or related to Greek basson, comparative of bathys “deep.” Figurative sense of “low in the moral scale” is first attested 1530s in English, earlier “servile” (1520s). Base metals (c.1600) were worthless in contrast to noble or precious metals.


1570s, “bottom or foundation (of something material),” from Latin basis “foundation,” from Greek basis “a step, stand, base, that whereon one stands,” from bainein “go, step” (see come). Transferred and figurative senses (of immaterial things) are from c.1600.


  1. The part of an organ nearest its point of attachment.
  2. A fundamental ingredient; a chief constituent of a mixture.
  3. Any of a large class of compounds, including the hydroxides and oxides of metals, having a bitter taste, a slippery solution, the capacity to turn litmus blue, and to react with acids to form salts.
  4. A molecular or ionic substance capable of combining with a proton to form a new substance.Brønsted base
  5. A nitrogen-containing organic compound that combines in such a manner.
  6. A substance that provides a pair of electrons for a covalent bond with an acid.

n. pl. ba•ses (-sēz′)

  1. The foundation upon which something, such as an anatomical part, rests.

  1. Chemistry
    1. Any of a class of compounds that form hydroxyl ions (OH) when dissolved in water, and whose aqueous solutions react with acids to form salts. Bases turn red litmus paper blue and have a pH greater than 7. Their aqueous solutions have a bitter taste. Compare acid.
    2. See nitrogen base.
  2. Mathematics
    1. The side or face of a geometric figure to which an altitude is or is thought to be drawn. The base can be, but is not always, the bottom part of the figure.
    2. The number that is raised to various powers to generate the principal counting units of a number system. The base of the decimal system, for example, is 10.
    3. The number that is raised to a particular power in a given mathematical expression. In the expression an, a is the base.

Plural bases (bā′sēz′)

  1. A set of independent vectors whose linear combinations define a vector space, such as a reference frame used to establish a coordinate system.

  1. A method of determining the relative positions of points in space by measuring the distances, and sometimes angles, between those points and other reference points whose positions are known. Triangulation often involves the use of trigonometry. It is commonly used in the navigation of aircraft and boats, and is the method used in the Global Positioning System , in which the reference points are satellites.

Any of a number of bitter-tasting, caustic materials. Technically, a material that produces negative ions in solution. A base is the opposite of an acid and has a pH of 7 to 14. A given amount of a base added to the same amount of an acid neutralizes the acid; water and a salt are produced. Alkalis are bases; ammonia is a common base.

see get to first base; off base; touch base.

see on a first-name basis.

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