a person, animal, plant, group, etc., that is part of a society, party, community, taxon, or other body.
a member of Congress, especially of the House of Representatives.
a member of the British Parliament, especially of the House of Commons.
any member of a legislative body.
a part or organ of an animal body; a limb, as a leg, arm, or wing.
Botany. a structural entity of a plant body.
the penis.
a constituent part of any structural or composite whole, as a subordinate architectural feature of a building.
either side of an equation.
an element of a set.
Geology. a stratigraphic unit recognized within a formation, and mapped as such.
being a member of or having membership in an association, organization, etc.: member countries of the United Nations.

1250–1300; Middle English membre < Old French < Latin membrum

memberless, adjective
submember, noun

6. element, portion. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
member (ˈmɛmbə)
1.  a person who belongs to a club, political party, etc
2.  any individual plant or animal in a taxonomic group: a member of the species
3.  any part of an animal body, such as a limb
4.  another word for penis
5.  any part of a plant, such as a petal, root, etc
6.  maths any individual object belonging to a set or logical class
7.  a distinct part of a whole, such as a proposition in a syllogism
8.  a component part of a building or construction
[C13: from Latin membrum limb, part]

Member (ˈmɛmbə)
1.  short for Member of Parliament
2.  short for Member of Congress
3.  a member of some other legislative body

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

early 13c., from O.Fr. membre (11c.), from L. membrum "limb, member of the body, part," ptobably from PIE *mems-ro (cf. Goth. mimz "flesh"). Specific sense of "penis" is first recorded mid-14c., from L. membrum virile. In English, "member of the body" is the original sense; that of "person belonging
to a group" is first attested early 14c., from notion of "constituent part of a complex structure." Meaning "one who has been elected to parliament" is from mid-15c.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

member mem·ber (měm'bər)

  1. A distinct part of a whole.

  2. A part or an organ of a human or animal body, especially a limb.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
member   (měm'bər)  Pronunciation Key 
  1. Mathematics

  2. A quantity that belongs to a set.

  3. The expression on either side of an equal sign.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The single member of the clan or the individual citizen was completely merged
  in the unity of the tribe or the state.
During the introspective, achingly beautiful fourth movement, an audience
  member's cellphone loudly rang.
The others are talking about me as a problem family member, so expectations
  build up in the audience.
Tunes written in one village would often be given lyrics by a member of a
  different community.
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