■ noun ( plural unities )
1》 the state of being united.
↘a thing forming a complex whole.
2》 Mathematics the number one.
3》 a dramatic principle requiring limitation of the supposed time of a drama to that occupied in acting it or to a single day ( ~ of time ), use of one scene throughout ( ~ of place ), or concentration on a single plot ( ~ of action ).
Origin
ME: from OFr. unite , from L. unitas , from unus 'one'.