(not comparable, US) Situated or happening outside the boundaries of a military base.

plural of conjugate base

(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 Lewis base

plural of base metal

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

(chemistry, sciences) A gas like ammonia that has basic properties.