noun, plural: transitions

(genetics) A substitution mutation in which a purine is replaced by another purine (e.g. A → G) or a pyrimidine with another pyrimidine (e.g. T → C).

(reproductive biology) The stage of childbirth that occurs before the expulsive phase of labor, and characterized by strong uterine contractions and nearly full cervical dilation.

(general) The passing from one state, form, style or place to another.


To make or undergo a transition.


Word origin: L. Transitio: cf. F. Transition. See transient.
Related forms: transitional (adjective)

Compare: transversion (genetics)
See also: point mutation (genetics)

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