ac·ro·bat [ákr? bàt] (plural ac·ro·bats) noun 1. gymnast entertainer: a performer of gymnastic feats as entertainment 2. facile changer of own opinions: somebody whose opinions or positions change readily to suit the circumstances [Early 19th century. Via French < Greek akrobatos "walking on tiptoe" < akros (see acro-) + bainein "to walk"] -ac·ro·bat·ic [àkr? báttik], adjective -ac·ro·bat·i·cal·ly, adverb