a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations; "in England they call a period a stop"
the end or completion of something; "death put a period to his endeavors"; "a change soon put a period to my tranquility"
a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"
one of three periods of play in hockey games
the interval taken to complete one cycle of a regularly repeating phenomenon
a stage in the history of a culture having a definable place in space and time; "a novel from the Victorian period"
the property of relative size or extent (whether large or small); "they tried to predict the magnitude of the explosion"; "about the magnitude of a small pea"
relative importance; "a problem of the first magnitude"
a commercially sponsored ad on radio or television
connected with or engaged in or sponsored by or used in commerce or commercial enterprises; "commercial trucker"; "commercial TV"; "commercial diamonds"
of the kind or quality used in commerce; average or inferior; "commercial grade of beef"; "commercial oxalic acid"
of or relating to commercialism; "a commercial attache"; "commercial paper"; "commercial law"
the discipline that studies the principles of transmiting information and the methods by which it is delivered (as print or radio or television etc.); "communications is his major field of study"
a serialized program usually dealing with sentimentalized family matters that is broadcast on radio or television (frequently sponsored by a company advertising soap products)
(biology) the field of science concerned with processes of communication and control (especially the comparison of these processes in biological and artificial systems)