(rare, mathematics, of a set) Being the interior of its closure.

(rare, mathematics, of a set) Being the closure of its interior.

(computer science) A formal language that can be expressed using a regular expression or finite-state machine.

(graph theory) A graph whose vertices all have the same degree.

(algebra) An element of a ring that is not a zero divisor.

(tennis) Describing a tennis ball having a thinner felt woven more tightly around the ball's core, designed for softer court surfaces such as clay.

plural of regular Joe

Alternative form of just folks

Alternative form of just folks

Alternative spelling of semiregular