With respect to financial or other assistance, derived from need rather than earned by merit.

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

Dated form of baseball. (ball game)

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

plural of conjugate base

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.