verb (used with object), for·ti·fied, for·ti·fy·ing.

  1. to protect or strengthen against attack; surround or provide with defensive military works.
  2. to furnish with a means of resisting force or standing strain or wear: to fortify cotton with nylon.
  3. to make strong; impart strength or vigor to: to fortify oneself with a good breakfast.
  4. to increase the effectiveness of, as by additional ingredients: to fortify a diet with vitamins; to fortify a lotion with lanolin.
  5. to strengthen mentally or morally: to be fortified by religious faith.
  6. to confirm or corroborate: to fortify an accusation with facts.
  7. Nutrition. to add one or more ingredients to (a food) to increase its nutritional content.
  8. to add alcohol to (wine or the like).

verb (used without object), for·ti·fied, for·ti·fy·ing.

  1. to set up defensive works; erect fortifications.

verb -fies, -fying or -fied (mainly tr)

  1. (also intr) to make (a place) defensible, as by building walls, digging trenches, etc
  2. to strengthen physically, mentally, or morally
  3. to strengthen, support, or reinforce (a garment, structure, etc)
  4. to add spirits or alcohol to (wine), in order to produce sherry, port, etc
  5. to increase the nutritious value of (a food), as by adding vitamins and minerals
  6. to support or confirmto fortify an argument with facts

v.early 15c., “increase efficacy” (of medicine); mid-15c., “provide (a town) with walls and defenses,” from Old French fortifiier (14c.) “to fortify, strengthen,” from Late Latin fortificare “to strengthen, make strong,” from Latin fortis “strong” (see fort) + facere “to make” (see factitious). Sense of “to strengthen mentally or morally” is from late 15c. Meaning “add liquor or alcohol” is from 1880. Related: Fortified; fortifying.

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