Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Old French
Origin: unité, from Latin unitas, from unus 'one'

unity

noun
     
u‧ni‧ty W3 plural unities
1 [uncountable] when a group of people or countries agree or are joined together:
economic unity
European unity
2 [uncountable] the quality of having matching parts:
His essays often lack unity.
3 [countable] technical one of the three related principles that say a play should be about a single set of related events which take place in one place on one day

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