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bisect: bisect: see section
ambisexual (adj.): "unisex" (of clothing), also "bisexual," 1912 in the jargon of psychology, from ambi- + sexual. As a humorous coinage based on ambidextrous, ambisextrous is recorded from 1929.
ambisexuality (n.): 1916, from ambisexual + -ity.
bisect (v.): "to cut in two," 1640s, from Modern Latin bisectus, from Latin bi- "two" (see bi-) + secare "to cut" (see section (n.)). Related: Bisected; bisecting.
bisection (n.): "division in two," 1650s, noun of state from bisect. Related: Bisectional.
bisector (n.): 1821; agent noun from bisect.
bisexual (adj.): 1824, "having both sexes in one being, hermaphroditic," from bi- + sexual. Meaning "attracted to both sexes" is from 1914; the noun in this sense is attested from 1922, and compare bisexuality. Not in general use until 1950s. Ambisexual was proposed in this sense early 20c.
I suggest that the term ambisexuality be used in psychology instead of the expression "bisexual predisposition." This would connote that we understand by this predisposition, not the presence of male and female material in the organism (Fliess), nor of male and female sex hunger in the mind, but the child's psychical capacity for bestowing his erotism, originally objectless, on either the male or the female sex, or on both. [S. Ferenczi, "Sex in Psycho-Analysis," transl. Ernest Jones, Boston, 1916]
bisexuality (n.): "attraction to both sexes" 1892, in translation of Krafft-Ebing; see bisexual + -ity.