n 1 a  :  the measured or measurable period during which an action, process, or condition exists or continues - see COAGULATION TIME PROTHROMBIN TIME REACTION TIME   b  :  a continuum which lacks spatial dimensions and in which events succeed one another from past through present to future  2  :  the point or period when something occurs  3  :  a moment, hour, day, or year as indicated by a clock or calendar <what is it>  .
 
 
 
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