verb (used without object), adhered, adhering.
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), adhered, adhering.
to cause to adhere; make stick: Glue will adhere the tiles to the wallboard.

1590–1600; < Medieval Latin adhērēre for Latin adhaerēre (ad- ad- + haerēre to stick, cling), perhaps via Middle French adhérer

adherable, adjective
adherer, noun
nonadhering, adjective
preadhere, verb (used without object), preadhered, preadhering.
unadhering, adjective

1. See stick2.

1. part, loosen. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adhere (ədˈhɪə)
1.  (usually foll by to) to stick or hold fast
2.  (foll by to) to be devoted (to a political party, cause, religion, etc); be a follower (of)
3.  (foll by to) to follow closely or exactly: adhere to the rules
[C16: via Medieval Latin adhērēre from Latin adhaerēre to stick to]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1590s, from Fr. adherer (15c.), from L. adhaerare "to stick to" (see adherent). Originally of persons, "to cleave to a leader, cause, party, etc. (cf. adherent, still often used in this sense); of things, from 1650s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Departing radically from past ideas on adhesion, it aims to show that any two
  materials can be made to adhere strongly.
Solder is a mixture of tin and lead because lead alone will not "wet"
  or adhere well to other metals.
However, as with any thing worth doing- any idea noble enough to propagate,
  those who adhere to it must persist in its evangelism.
The sugar melts, caramelizes and becomes sticky, causing the soy-spice mixture
  to adhere beautifully to the skin of the duck.
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