(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

An astronomical telescope mounted in the meridian and turning on a fixed east-and-west axis.

plural of transit lounge

(aviation) A waiting room at an (international) airport for passengers changing flights, or for long-haul passengers who have to leave their aircraft while it is serviced and refuelled (in both cases for passengers who haven't finished their journey).