Something tacit is implied or understood without question. Holding hands might be a tacit acknowledgment that a boy and girl are dating.

The adjective tacit refers to information that is understood without needing to acknowledge it. For example, since we know that the sky is blue, that kind of assumption is tacit. Lawyers talk about "tacit agreements," where parties give their silent consent and raise no objections.

Definitions of tacit

adj implied by or inferred from actions or statements

“a tacit agreement”
silent, understood
implicit, inexplicit
implied though not directly expressed; inherent in the nature of something

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