(mathematical analysis, measure theory) A family of sets that is closed under finite unions and differences.

plural of ring

(gymnastics) A gymnastics apparatus and discipline consisting of 2 rings suspended from a bar. / (post-mid century) Ellipsis of still rings. / A traditional Irish game of throwing rings onto hooks.

Third-person singular simple present indicative form of ring

A surname originating as an occupation for a maker of rings as jewelry or as in harness. / A parish of County Waterford, Ireland.

Marked with rings, circles, or loops. / (literary, archaic) Wearing a wedding ring; hence, lawfully wedded.

simple past tense and past participle of ring (circled, enclosed)

To make a phone call to (this place). / (transitive) To celebrate by ringing of bells or as if by ringing of the bells.

(transitive) To encircle, to surround in a ring, engirdle.

Third-person singular simple present indicative form of ring in