A unit of measurement which is not itself defined in terms of other units, and from which other units may be derived. / The main unit of a computer or hi-fi system.

plural of base unit

(baseball, softball) A play where a runner on any base runs to the next base, usually while the pitcher pitches to a batter. Such a runner is liable to be put out if tagged with the ball while not in contact with any base.

plural of base pair

(biology) In molecular biology, two nucleotides on opposite complementary DNA or RNA strands that are connected via hydrogen bonds.

(chemistry) Any metal at the lower end of the electrochemical series that oxidizes readily. / (metallurgy) The metal to be welded (rather than that used to weld). / A common or inexpensive metal.

plural of base metal

(idiomatic, business) The number of units of a system or product that are currently in use.

The fans of a thing or person taken as a group.

A parachute jump from a fixed point rather than from an aircraft; typically from a tall building, high bridge or rock formation.