Adhere, v. i. [imp. & p. p. Adhered; p. pr. & vb. n. Adhering.]
Etymology: [L. adhaerere, adhaesum; ad + haerere to stick: cf. F. adhérer. See Aghast.]
1. To stick fast or cleave, as a glutinous substance does; to become joined or united; as, wax to the finger; the lungs sometimes adhere to the pleura.
2. To hold, be attached, or devoted; to remain fixed, either by personal union or conformity of faith, principle, or opinion; as, men adhere to a party, a cause, a leader, a church.
3. To be consistent or coherent; to be in accordance; to agree. "Nor time nor place did then adhere." Every thing adheres together." Shak.
Syn. -- To attach; stick; cleave; cling; hold
Shades of meaning
Fernald lists adhere only as an antonym, under fluctuate.
He lists it without comment; the entries above explain its neighbors.