An electronic circuit which changes the phase of a signal by 180°; used in the input stage of a push-pull amplifier.

The latter part of the menstrual cycle, that occurs after ovulation, in which the corpus luteum secretes progesterone to prepare the endometrium for the implantation of an embryo.

(transitive) To remove or relinquish the use of (something) little by little, either via discrete diminishing phases or (by extension) by continuous gradations; to remove in phases, or as if by phases (gradually).

(mathematics, physics, dynamical system theory) Given a (dynamical) system, any topological space such that every point in the space's underlying set uniquely represents a state of the system and every possible state is represented by some point;

(electricity) Having two alternating currents whose phases differ by 90°.

(physiology) The phase of the estrous cycle which involves the follicular maturation within the ovary and is controlled by the hormone estradiol.

(transitive) To gradually reduce the size or scale of

(quantum mechanics) A normalized complex number, considered as, say, the scalar coefficient of a ket.

A type of superconducting phase, characterized by the presence of Cooper pairs with nonzero center-of-mass momentum and a spatially non-uniform superconducting order parameter.

A device, often built into a screwdriver, used to check for electric current.