transition (redirected from transitionary)

transition /tran·si·tion/ (tran-zĭ´shun)

1. a passage or change from one state or condition to another.

2. in molecular genetics, a point mutation in which a purine base replaces a pyrimidine base or vice versa.transi´tional

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tran·si·tion (trn-zshn)

n.

1. A period during childbirth that precedes the expulsive phase of labor, characterized by strong uterine contractions and nearly complete cervical dilation.

2. A point mutation in a polynucleic acid, in which a pyrimidine is replaced by another pyrimidine, or a purine is replaced by another purine.

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transition

[tranzish′ən]

Etymology: L, transire, to go through

the last phase of the first stage of labor, sometimes indicated by cervical dilation of 8 to 10 cm.