favor

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A gracious, friendly, or obliging act that is freely granted.
• noun Friendly or favorable regard; approval or support.
• noun A state of being held in such regard.
• noun Unfair partiality; favoritism.
• noun A privilege or concession.
• noun Permission to engage in sexual activity, especially when granted by a woman to a male partner.
• noun Something given as a token of love, affection, or remembrance.
• noun A small decorative gift given to each guest at a party.
• noun Advantage; benefit.
• noun Behalf; interest.
• noun Obsolete A communication, especially a letter.
• noun Aspect or appearance.
• noun Countenance; face.
• noun Obsolete A facial feature.
• intransitive verb To perform a kindness or service for; oblige. synonym: oblige.
• intransitive verb To have a liking for; be partial to; prefer.
• intransitive verb To approve, advocate, or support.
• intransitive verb To show partiality or unfair preference to.
• intransitive verb To believe to be most likely to succeed.
• intransitive verb To be advantageous to; make more likely to be successful.
• intransitive verb To speed up or otherwise increase the success of (a chemical process or pathway).
• intransitive verb To treat with care; be gentle with.
• intransitive verb Chiefly Southern US To resemble in appearance.
• intransitive verb To resemble another in appearance.
• idiom (in favor of) In support of; approving.
• idiom (in favor of) To the advantage of.
• idiom (in favor of) Inscribed or made out to the benefit of.

from The Century Dictionary.

• To regard with favor; entertain favor for; be disposed to aid; countenance; befriend; regard or treat with favor or partiality; accommodate: as, to favor the weaker side.
• To be favorable to; facilitate or render easier: as, the darkness of the night favored the enemy's approach.
• To resemble in features or aspect; look somewhat like.
• To ease; spare: as, to favor a lame leg.
• To extenuate; palliate; represent favorably, as in painting or description.
• Synonyms To patronize, help, assist.
• To have the semblance (of).
• noun Good will; kind regard; countenance; friendly disposition; a willingness to aid, support, or defend.
• noun The state of favoring or of being favored; friendly consideration bestowed or received; objective regard, aid, support, or behoof: with in: as, to be or act in favor of a person or thing; to resign an office in favor of another; he is in high favor at court or with the people.
• noun The object of kind regard; the person or thing favored.
• noun A kind act or office; kindness done or manifested; any act of grace or good will, as distinguished from acts of justice or remuneration.
• noun Partial kindness; biased regard or consideration; predilection; partiality: as, kissing goes by favor; a fair field and no favor.
• noun Leave; permission; indulgence; concession.
• noun Advantage; convenience afforded for success: as, the enemy approached under favor of the night.
• noun Something bestowed as a token of good will or of love; a gift or present; hence, a gift, usually from a woman to a man, as a sleeve, glove, or knot of ribbons, to be worn, as a token of friendship or love, at a fair or wedding, in a festive assembly, or habitually, as formerly in knight-errantry.
• noun Countenance; appearance; look; features.
• noun A charm; attraction; grace.