member-n; 3 Senses

Sense Number 1: part of a social unit

Commentary: MEMBER[+role][+social][+participant][+organization/+family] (NP/NP's){+social_group} MEMBER{+person/+organization} MEMBER[+person] MEMBER[+organization] of NP{+social_group}
NOTE: entails the existence of a recognized social institution (this is not the case for Sense 3 below)

Mary introduced me to all her family members.
Only members will be admitted to this club.
Mrs. Watson is a member of the faculty.
The United Nations' members include Canada.
The library is a member of the Interlibrary Loan Association.

WordNet 3.0 Sense Numbers: 1, 4

Sense Number 2: physical portion of anatomy

Commentary: MEMBER[+anatomy][+animal][+portion][+projecting] MEMBER[+physical] of NP{+possessor} NP/MOD{+possessive} MEMBER{+physical}

Keep all your members away from that rotating saw.
The pervert flashed his member at the audience.

WordNet 2.0 Sense Numbers: 3, 5

Sense Number 3: constituent element of a larger class

Commentary: MEMBER[+relation][+set][+element][+abstract/+concrete] MEMBER[+instance] of NP{+class} NP's{+class} MEMBER{+instance} In a classification scheme, something that is part of a set or class.
NOTE: focus is on classification of natural kinds of things, not inclusion in a social institution (see Sense 1)

Snakes are members of the class Reptilia.
Mary had a hard time meeting members of the opposite sex.
'i' is a member of the set of imaginary numbers.

WordNet 2.0 Sense Numbers: 4