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Definitions of period:

noun:   a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations
Example: "In England they call a period a stop"

noun:   the end or completion of something
Example: "Death put a period to his endeavors"

noun:   a unit of geological time during which a system of rocks formed
Example: "Ganoid fishes swarmed during the earlier geological periods"

noun:   one of three periods of play in hockey games
noun:   the interval taken to complete one cycle of a regularly repeating phenomenon
noun:   a stage in the history of a culture having a definable place in space and time
Example: "A novel from the Victorian period"

noun:   an amount of time
Example: "A time period of 30 years"

noun:   the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause

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Alternative Terms
chemical-element period-periodic-table periodic-table group-periodic-table alkali-metal alkaline-earth-metal group-3-element group-4-element group-5-element group-6-element group-7-element group-8-element group-9-element group0-element group1-element group2-element boron-group carbon-group nitrogen-group chalcogen halogen noble-gas lithium beryllium boron carbon nitrogen oxygen fluorine neon electron-configuration lanthanide actinide transition-metal poor-metal metalloid nonmetal atomic-mass-table electronegativity alternative-periodic-tables list-of-elements-by-name list-of-elements-by-symbol list-of-elements-by-atomic-number list-of-elements-by-boiling-point list-of-elements-by-melting-point list-of-elements-by-density list-of-elements-by-atomic-mass period-element period-3-element period-4-element period-5-element period-6-element period-7-element period-8-element s-block p-block d-block f-block g-block list-of-chemistry-topics

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