(chemistry) A transition element

(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.

(computing theory) A function from (state, input symbol) to state describing what state to move to on receiving a given input in a given state.

(chemistry) Any of the group of metallic elements that have an incomplete inner (d) electron shell, having multiple valencies and forming coloured compounds and stable complex ions; the elements from scandium through copper, and those lying below them in the periodic table.

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.

(physics) The temperature at which one phase of a material changes into another; a transition point / (physics, chemistry) The temperature at which one form of a polymorph changes into another

A large-scale transportation system in which the passengers do not travel in their own vehicles.

(economy) A national economy that is changing from being centrally planned to a market economy

plural of transit instrument