Transition

transition

A change from one condition or state to another. See digital TV transition and slide transition.

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transition

1. Music

a. a movement from one key to another; modulation

b. a linking passage between two divisions in a composition; bridge

2. a style of architecture that was used in western Europe in the late 11th and early 12th century, characterized by late Romanesque forms combined with early Gothic details

3. Physics

a. any change that results in a change of physical properties of a substance or system, such as a change of phase or molecular structure

b. a change in the configuration of an atomic nucleus, involving either a change in energy level resulting from the emission of a gamma-ray photon or a transformation to another element or isotope

4. a sentence, passage, etc., that connects a topic to one that follows or that links sections of a written work

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transition [tran′zish·ən]

(cell and molecular biology)

A mutation resulting from the substitution in deoxyribonucleic acid or ribonucleic acid of one purine or pyrimidine for another.

(communications)

Change from one circuit condition to the other; for example, the change from mark to space or from space to mark.

(quantum mechanics)

The change of a quantum-mechanical system from one energy state to another.

(thermodynamics)

A change of a substance from one of the three states of matter to another.

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Transition 

in biology, a type of mutation involving replacement of the nitrogenous base in deoxyribonucleic acid (DNA). In transition, one purine base is replaced by another purine base (adenine for thymine, or vice versa), and the pyrimidine base by another pyrimidine base (guanine for cystosine, or vice versa).