An electrical switch, in a generator or motor, that periodically reverses the direction of an electric current.
A binary map in a given group G, given by [g, h] = ghg⁻¹h⁻¹, where g and h are elements of G, which yields the group's identity if and only if the group operation commutes for g and h.
A binary map in a given ring R, given by [a, b] = ab − ba, where a and b are elements of R, which yields the ring's zero element if and only if the multiplication operation commutes for a and b.
A change between forward and backward motion without stopping.
A word or phrase connecting one part of a discourse to another.
A published procedure for instrument flight, coming between the departure and en-route phases of flight, or between en-route flight and an approach/landing procedure.
Professional special education assistance for children or adults in the process of leaving one educational environment or support program for another to relatively more independent living.
A point mutation in which one base is replaced by another of the same class (purine or pyrimidine); compare transversion.
Death; passing from life into death.
The process of change from one form, state, style or place to another.
A change of key.
A change from defense to attack, or attack to defense.
A brief modulation; a passage connecting two themes.
The process or act of changing from one gender role to another, or of bringing one's outward appearance in line with one's internal gender identity.
The onset of the final stage of childbirth.
To make a transition.
To change from one gender role to another, or bring one's outward appearance in line with one's internal gender identity.
To bring through a transition; to change.