ETYM Latin singulus, a dim. from the root in simplex simple; cf. Old Eng. and Old Fren. sengle, from Latin singulus. See Simple, Singular.
(Botany; of flowers) Having usually only one row or whorl of petals.
1. Existing alone or consisting of one entity or part or aspect or individual.
2. Having uniform application.
3. Involved two individuals.
4. Not divided among or brought to bear on more than one object or objective; SYN. undivided, exclusive.
To hit a one-base hit, in baseball.