period

noun:a length or portion of time characterized by particular events or conditions
- The Renaissance was a period of great artistic achievement.
noun:the punctuation mark (.) used to end a sentence or abbreviation
- She placed a period at the end of the statement.
noun:the monthly menstrual cycle in human females
- She missed work because of a severe period.
noun:the duration of one complete cycle of a repeating phenomenon, such as a wave or pendulum
- The pendulum's period is two seconds.
noun:one of the divisions of a sports game
- The second period ended with the home team leading.
interjection:used to emphasize that a stated fact is final and definitive
- I'm not going to the party, period.