verb (used without object), ad·hered, ad·her·ing.
- to stay attached; stick fast; cleave; cling (usually followed by to): The mud adhered to his shoes.
- Physics. (of two or more dissimilar substances) to be united by a molecular force acting in the area of contact.
- to be devoted in support or allegiance; be attached as a follower or upholder (usually followed by to): to adhere to a party.
- to hold closely or firmly (usually followed by to): to adhere to a plan.
- Obsolete. to be consistent.
verb (used with object), ad·hered, ad·her·ing.
- to cause to adhere; make stick: Glue will adhere the tiles to the wallboard.
- (usually foll by to) to stick or hold fast
- (foll by to) to be devoted (to a political party, cause, religion, etc); be a follower (of)
- (foll by to) to follow closely or exactlyadhere to the rules
1590s, from Middle French adhérer (15c.) or directly from Latin adhaerare “to stick to” (see adherent). Originally often of persons, “to cleave to a leader, cause, party, etc.” (cf. adherent, still often used in this sense). Related: Adhered; adhering.