an amount of time
the interval taken to complete one cycle of a regularly repeating phenomenon
a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations
(ice hockey) one of three divisions into which play is divided in hockey games
the (usually elliptical) path described by one celestial body in its revolution about another
move in an orbit
an area in which something acts or operates or has power or control: "the range of a supersonic jet"
a particular environment or walk of life
the path of an electron around the nucleus of an atom
