Answer: period

AnswerCrossword Clue
PERIOD

Sentence ender

PERIOD

Age

PERIOD

Game division

PERIOD
Meaningful interval
PERIOD
Sentence stopper
PERIODClass day division
PERIODTime in a classroom
PERIODStop sign?
PERIODClass time
PERIOD"End of story!"
PERIODAbbreviation punctuation
PERIOD"... and that's final!"
PERIOD" ... and that's final"
PERIODGeologic unit
PERIODEnd of a sentence
PERIODIt's at the end of the line
PERIODSentence-ending mark
PERIODEra
PERIODAnother name for "Costume" play.
PERIODOne-fourth of a football game.
PERIODTime.
PERIODComplete musical statement.
PERIODInterval.
PERIODEpoch.
PERIODTime interval
PERIOD.
PERIODArtistic stage
PERIODDivision of a hockey game
PERIODStage
PERIOD..... piece
PERIODQuarter or half
PERIODSentence-ending dot
PERIODOne of three in hockey
PERIODSentence ending
PERIOD". . . and that's final!"
PERIOD"That's it"
PERIODEnd of a story
PERIOD... piece