[‚prä·pə¦zish·ənəl kə′nek·tivz] (mathematics) The symbols ∼, ∧, ∨, → or ⊃, and ↔ or ≡, denoting logical relations that may be expressed by the phrases “it is not the case that,” “and,” “or,” “if … , then,” and “if and only if.” Also known as sentential connectives.