Tacit/ˈtæsɪt/ Definition 1 of 3Pro Tip 1/2Nonverbal Agreement Tacit often describes agreements made without words, just by actions or body language. They shared a tacit understanding and left the meeting early. Pro Tip 2/2Silent Consensus People might share a tacit belief or opinion without discussing it. The nodding heads in the room showed tacit agreement with the speaker.