Definition of bisexual
1a
see usage paragraph below
: of, relating to, or characterized by sexual or romantic attraction to people of one's same sex and of the opposite sex
also
: of, relating to, or characterized by sexual or romantic attraction to people of one's own gender identity and of other gender identities
b
biology
: possessing characters of both sexes and especially both male and female reproductive structures : hermaphroditic
Usually, the sexes are separate but some plants bear bisexual flowers at different times of the year and these may suddenly become exclusively female.— Stephen K-M. Tim
2
: of, relating to, involving, or characteristic of both sexes
A number of insects combine the advantages of parthenogenesis with those of bisexual reproduction using an alternation of generations.— R. F. Chapman The Bionic Woman of the television serial of the seventies … has the bisexual name of Jamie Summers.— Marina Warner
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Merriam-Webster unabridged
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Time Traveler for bisexual
The first known use of bisexual was in 1793
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