Definition of Monandry

Babylon English Dictionary
marriage to one husband at a time; act of having sexual relationship with only one man at a time
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Monandry Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
The possession by a woman of only one husband at the same time; -- contrasted with polyandry.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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monandry
\mo*nan"dry\ (?), n. [see monandria.] the possession by a woman of only one husband at the same time; -- contrasted with polyandry.

Grandiloquent Dictionary
The practice of having a single husband at a time
WordNet 2.0

Noun
1. having only one husband at a time
(hypernym) marriage, matrimony, union, spousal relationship, wedlock