member

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

• noun A distinct part of a whole, especially.
• noun Linguistics A syntactic unit of a sentence; a clause.
• noun Logic A proposition of a syllogism.
• noun Mathematics An element in a set.
• noun A part or an organ of a human or animal body, as.
• noun A limb, such as an arm or a leg.
• noun The penis.
• noun A part of a plant.
• noun One that belongs to a group or organization.
• noun Mathematics The expression on either side of an equality sign.
• noun A structural unit, such as a beam or wall.

from The Century Dictionary.

• noun In English law, a place where a custom-house has been kept of old time, with officers or deputies in attendance. Such localities were lawful places of exportation or importation.
• noun An integral part of an animal body having a distinct function; a vital organ; particularly, in common use, one of the limbs or extremities, as a leg, an arm, or a wing.
• noun Specifically, the private parts.
• noun Figuratively, anything likened to a part of the body.
• noun A part of any aggregate or whole; one of a number of associated parts or entities; any unit or division that can be considered separately as part of a total.
• noun Specifically— A person considered in relation to any aggregate of individuals to which he belongs; particularly, one who has united with or has been formally chosen as a corporate part of an association or public body of any kind, as a church or a society: often used elliptically in England for a member of Parliament, and in the United States for a member of Congress.
• noun A part of a discourse, or of a period or sentence; a clause; a part of a verse.
• noun In architecture, any subordinate part of a building, order, or composition, as a frieze, cornice, or molding.
• noun In algebra, either of the two parts or sides of an equation united by the sign of equality (=).
• noun In zoology and botany, a component of any higher classificatory group: thus, a species is a member of a genus; a genus is a member of a family, etc.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb obsolete To remember; to cause to remember; to mention.
• noun (Anat.) A part of an animal capable of performing a distinct office; an organ; a limb.
• noun A part of a whole; an independent constituent of a body.
• noun A part of a discourse or of a period or sentence; a clause; a part of a verse.
• noun (Math.) Either of the two parts of an algebraic equation, connected by the sign of equality.
• noun (Engin.) Any essential part, as a post, tie rod, strut, etc., of a framed structure, as a bridge truss.
• noun (Arch.) Any part of a building, whether constructional, as a pier, column, lintel, or the like, or decorative, as a molding, or group of moldings.
• noun One of the persons composing a society, community, or the like; an individual forming part of an association.
• noun (Math.) one of the elements which, taken together, comprise a set.
• noun (Math.) one of the individual objects which comprise a group or class.
• noun (Engin.) a member, as a rod, brace, etc., which is subjected to compression or tension, respectively.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One who officially belongs to a group.
• noun A part of a whole.
• noun A limb.
• noun The penis.
• noun logic One of the propositions making up a syllogism.
• noun set theory An element of a set.
• noun computing, programming In object-oriented programming, a function or piece of data associated with each separate instance of a class.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the male organ of copulation (`member' is a euphemism)
• noun an organization that is a member of another organization (especially a state that belongs to a group of nations)
• noun anything that belongs to a set or class
• noun an external body part that projects from the body
• noun one of the persons who compose a social group (especially individuals who have joined and participate in a group organization)