\Con"ju*gate\, a. [L. conjugatus, p. p. or conjugare
to unite; con- + jugare to join, yoke, marry, jugum yoke;
akin to jungere to join. See {Join}.]
1. United in pairs; yoked together; coupled.
2. (Bot.) In single pairs; coupled.
3. (Chem.) Containing two or more radicals supposed to act
   the part of a single one. [R.]
4. (Gram.) Agreeing in derivation and radical signification;
   -- said of words.
5. (Math.) Presenting themselves simultaneously and having
   reciprocal properties; -- frequently used in pure and
   applied mathematics with reference to two quantities,
   points, lines, axes, curves, etc.
{Conjugate axis of a hyperbola} (Math.), the line through the
   center of the curve, perpendicular to the line through the
   two foci.
{Conjugate diameters} (Conic Sections), two diameters of an
   ellipse or hyperbola such that each bisects all chords
   drawn parallel to the other.
{Conjugate focus} (Opt.) See under {Focus}.
{Conjugate mirrors} (Optics), two mirrors so placed that rays
   from the focus of one are received at the focus of the
   other, especially two concave mirrors so placed that rays
   proceeding from the principal focus of one and reflected
   in a parallel beam are received upon the other and brought
   to the principal focus.
{Conjugate point} (Geom.), an acnode. See {Acnode}, and
   {Double point}.
{Self-conjugate triangle} (Conic Sections), a triangle each
   of whose vertices is the pole of the opposite side with
   reference to a conic.

\Con`ju*gate\, n. [L. conjugatum a combining,
etymological relationship.]
1. A word agreeing in derivation with another word, and
   therefore generally resembling it in signification.
         We have learned, in logic, that conjugates are
         sometimes in name only, and not in deed. --Abp.
                                               Bramhall.
2. (Chem.) A complex radical supposed to act the part of a
   single radical. [R.]

\Con"ju*gate\, v. t. [imp. & p. p. {Conjugated}; p.
pr. & vb. n. {Conjugating}.]
1. To unite in marriage; to join. [Obs.] --Sir H. Wotton.
2. (Gram.) To inflect (a verb), or give in order the forms
   which it assumed in its several voices, moods, tenses,
   numbers, and persons.

\Con"ju*gate\, v. i. (Biol.)
To unite in a kind of sexual union, as two or more cells or
individuals among the more simple plants and animals.