(UK, Ireland) A town in the British and Ireland that is a member of the Transition Towns movement and is striving to develop a higher standard of living and an environmentally friendly future.

(chemistry) An intermediate state in a chemical reaction that has a higher free energy than the reactants or the products

(mathematics, stochastic processes) A square matrix whose rows consist of nonnegative real numbers, with each row summing to 1. Used to describe the transitions of a Markov chain; its element in the ith row and jth column describes the probability of moving from state i to state j in one time step.

plural of transition point

(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

(US) Public transport.

plural of public transit

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.

plural of transition altitude

plural of transition level