(logic) A formal deductive system able to represent the distinction between intension and extension of a term.

(transitive) To give great joy, delight or pleasure to. / (transitive, rare) To give too much joy to. / (intransitive, obsolete) To take too much pleasure (in something).

A surname. / A locality in the Mackay Region, Queensland, Australia. / A rural locality in the Mid North, South Australia. / A town in Newfoundland, Newfoundland and Labrador, Canada.

plural of ISA