strict or thorough in the performance of duty: a faithful worker.
true to one's word, promises, vows, etc.
steady in allegiance or affection; loyal; constant: faithful friends.
reliable, trusted, or believed.
adhering or true to fact, a standard, or an original; accurate: a faithful account; a faithful copy.
Obsolete. full of faith; believing.
the faithful.
the believers, especially members of a Christian church or adherents of Islam.
the body of loyal members of any party or group.

1250–1300; Middle English feithful. See faith, -ful

faithfully, adverb
faithfulness, noun
overfaithful, adjective
overfaithfully, adverb
overfaithfulness, noun
pseudofaithful, adjective
pseudofaithfully, adverb
quasi-faithful, adjective
quasi-faithfully, adverb

1, 3. true, devoted, staunch. 3. Faithful, constant, loyal imply qualities of stability, dependability, and devotion. Faithful implies long-continued and steadfast fidelity to whatever one is bound to by a pledge, duty, or obligation: a faithful friend. Constant suggests firmness and steadfastness in attachment: a constant affection. Loyal implies unswerving allegiance to a person, organization, cause, or idea: loyal to one's associates, one's country. 5. precise, exact. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
faithful (ˈfeɪθfʊl)
1.  having faith; remaining true, constant, or loyal
2.  maintaining sexual loyalty to one's lover or spouse
3.  consistently reliable: a faithful worker
4.  reliable or truthful: a faithful source
5.  accurate in detail: a faithful translation
6.  the faithful
 a.  the believers in and loyal adherents of a religious faith, esp Christianity
 b.  any group of loyal and steadfast followers

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

c.1300, full of faith, also firm in allegiance, from faith + -ful. Meaning true to the facts is from 1520s. The noun sense of true believers is from 1550s. Related: Faithfully; faithfulness.
Online Etymology Dictionary, © 2010 Douglas Harper
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Bible Dictionary

Faithful definition

as a designation of Christians, means full of faith, trustful, and not simply trustworthy (Acts 10:45; 16:1; 2 Cor. 6:15; Col. 1:2; 1 Tim. 4:3, 12; 5:16; 6:2; Titus 1:6; Eph. 1:1; 1 Cor. 4:17, etc.). It is used also of God's word or covenant as true and to be trusted (Ps. 119:86, 138; Isa. 25:1; 1 Tim. 1:15; Rev. 21:5; 22:6, etc.).

Easton's 1897 Bible Dictionary
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Example sentences
Make no mistake, there are many people who faithfully review almost everything
  that they are asked to look at.
Yet, as anyone trying to live faithfully in this world knows full well, there
  is no faith without doubt.
Readers expect a short review to faithfully report, not expound upon, the
People who faithfully attended instructional sessions definitely had better
  weight loss.
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