affinity group definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A group of people who share a common interest, background, or goal.
affinity group - Computer Definition
A special interest group. This is a marketing term for a group of people with similar interests.