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co·mem·ber | \ ˌkō-ˈmem-bər 
\
\variants:
or co-member
plural comembers or co-members
Definition of comember
: one of two or more members of a group : a fellow member
the newest comember of the troupe … Durham and his committee co-members still are planning more growth beyond Europe.— Business Week
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Time Traveler for comember
The first known use of comember was in 1798
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