transition(redirected from transitions)
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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).
ii. A sudden changeover from a blind instrument approach to visual on first sighting the runway.
iii. The change(s) involved in passing from flying one type of aircraft to flying another, especially in connection with transition training.
iv. A published procedure (DP Transition) used to connect the basic DP (departure procedure) to one of several en route airways/jet routes, or a published procedure (STAR Transition) used to connect one of several en route airways/jet routes to the basic STAR (standard terminal arrival route).
v. The position at which the laminar flow changes into a turbulent flow on an airfoil.