Learner's definition of MEMBER
1 : someone or something that belongs to or is a part of a group or an organization
a club/committee/team member
The club has 300 members.
She is a member of the House of Representatives.
She is a member/Member of Parliament.
a member of the audience
This bird is a member of the finch family.
countries that are members of the United Nations
2 technical : a part of a structure (such as a building or a bridge) 3 a old-fashioned : a body part (such as an arm or a leg) b — used as a polite way of saying penis