Definition of intercourse
1
: physical sexual contact between individuals that involves the genitalia of at least one person
anal intercourse oral intercourse
especially
: sexual intercourse sense 1
heterosexual intercourse
2
: exchange especially of thoughts or feelings : communion
3
: connection or dealings between persons or groups
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Merriam-Webster unabridged
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The first known use of intercourse was in the 15th century
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