being or involving basic facts or principles; "the fundamental laws of the universe"; "a fundamental incomatibility between them"; "these rudimentary truths"; "underlying principles"
far-reaching and thoroughgoing in effect especially on the nature of something; "the fundamental revolution in human values that has occurred"; "the book underwent fundamental changes"; "committed the fundamental error of confusing spending with extravagance"; "profound social changes"
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"