plural of pre-alpha version

(geology) A stratum laid down prior to that of a saline layer (formed from encroachment by a sea)

Alternative form of premenstrual syndrome

(US) A medical condition that started before a person's health insurance went into effect.

preestablished harmony

(electronics) A technique utilized to increase linearity or compensate for nonlinearity in power amplifiers.

plural of digital pre-distortion

(grammar) A nonfinite verb form that indicates an ongoing action or state and which can function as an adjective.

The head of state of a republic. / In presidential republics, the head of government and head of state.

(archaic) Occupying the first rank or chief place; having the highest authority; presiding.