noun.
In grammar, the case expressing direction toward. Also called terminalis.
Of or pertaining to transition; containing, involving, or denoting transition; changing; passing: as, the transitional stages of a tadpole; the transitional plumage of a molting bird.
In biology, of intermediate or intergraded character between two or more species, genera, etc., and thus, as it were, exhibiting or illustrating a transition from one to another form of organic life; transmutational: as, a transitional specimen; also, pertaining to or effecting such transmutation: as, a transitional theory; a transitional process.
Specifically, in art, relating to, characterizing, or belonging to an epoch or stage of change from one style or state of development to the next succeeding, and especially to that between archaism and full development in Greek art, and to that between the Romanesque and the Pointed in medieval art.