Of feelings, ideas, beliefs, etc., or the expression of these. Soundness or credibility of an argument, case, or evidence; the extent of this, the…

The quality of being well-founded on fact, or established on sound principles, and thoroughly… In the phrase of…validity.

Logical argumentation; a mode of argumentation viewed as good or bad according to its conformity or want of conformity to logical principles. to chop…

The cogency or weight of an argument; clearness of evidence or proof; a compelling reason.

Of argument, demonstration, etc.

esp. Power of compelling conviction or assent, convincing quality, forcibleness, logical or persuasive force.

= pregnancy, n.2

Validity.

= cogency, n.