(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 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.

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

(chemistry) A transition element

plural of transition metal

plural of transition element

(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

(physics) The stage in the flow or a fluid during which it changes from laminar to turbulent / (geology) The region between the upper and lower mantle characterized by a rapid increase in density