bisexual
adjective
                                                                                                                            
                                                            bi·sex·u·al
                    
                                                                                                              
                                                                                                                                  (ˌ)bī-ˈsek-sh(ə-)wəl  
                                                                                                                              
            -shəl
                                                      
                                                          1
                    
        a
    
          
                                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
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
R. F. Chapman
                                       The Bionic Woman of the television serial of the seventies … has the bisexual name of Jamie Summers.— Marina Warner
Marina Warner
                         
                
                    
                                                      bisexual
                                      noun
                                                                            
    
While educational and advocacy groups tend to define bisexual broadly as applying to sexual or romantic attraction to members of one's own gender identity as well as to members of other gender identities, the older, narrower application describing attraction to male and female people persists among English speakers, aided, no doubt, by the word's morphology: the prefix bi- means "two." Note that while the broader meaning of bisexual can be understood as occupying the same semantic territory as pansexual, there are people who identify as one but not the other, as well as people who identify as both.
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  Merriam-Webster unabridged




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