What does adhere mean?
The definition of adhere
Ad*here”, v. i.
[imp. & p. p. Adhered; p. pr. & vb. n. Adhering.]
Etym: [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.

Synonyms
— To attach; stick; cleave; cling; hold