Definition of "playmate" [play•mate]

• A companion in play or recreation. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Tadpole will love this angel baby – a built-in playmate for life."
• "But one quiet dog, without her playmate, is no trouble to anyone."
• "Each of these 121 girls was taken into a room with a "playmate" -- a trained research associate in her 20s who had experience working with children."