(grammar): A verb that is accompanied (either clearly or implicitly) by a direct object in the active voice. It links the action taken by the subject with the object upon which that action is taken. Consequently, transitive verbs can also be used in the passive voice when the direct object of the equivalent active-voice sentence becomes the subject.

(physics) The transition between thermodynamic phases of a physical system, especially one between the solid, liquid, and gaseous phases of a substance.

(advertising) One of four archetypal dramatic structures of commercials, characterized by an emotionally neutral beginning with an enormous leap in positive emotions generated by seeing the branded product in use.

In amorphous materials, gradual and reversible transition from a hard and relatively brittle "glassy" state into a viscous or rubbery state (or opposite) over a range of temperature range.

(fluid dynamics) The point in space at which fluid flow around an object changes from laminar to turbulent.

(chemistry) A transition element

(Australia, New Zealand) A freeway lane reserved for vehicles with a set minimum number of occupants.

A commuter rail system that combines aspects of an interurban railway with those of a subway, using a menagerie of pathways such as viaduct, tunnel, beam, cut and cover, trench, at grade, and others.

(US) Public transport.

plural of public transit