[mass noun]adroitness and sensitivity in dealing with others or with difficult issues (交往、办事的)机敏;圆通 the inspector broke the news to me with tact and consideration. 检察员机敏谨慎地向我透露了这个消息。
语源
mid 17th cent. (denoting the sense of touch): via French from Latin tactus 'touch, sense of touch', from tangere 'to touch'