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:'' 'Conjugal' redirects here. For the type of prison visit, see conjugal visit.''
'Conjugation' may refer to:

★ Grammatical conjugation, the modification of a verb from its basic form.

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★ Latin conjugation, Spanish conjugation and the English verb, each with complex conjugation forms.

★ Marriage, relationship between two or more individuals.
In 'mathematics':

★ Complex conjugation, the operation which multiplies the imaginary part of a complex number by −1; see also conjugate element (field theory).

★ The conjugate transpose of a matrix with complex entries is created by taking the transpose of the matrix and the complex conjugate of each entry.

★ A conjugate in algebra is similar to a complex conjugate, but is used to rationalize the denominator of a fraction.

★ In group theory, if ''a'' is an element of a group, then the map ''f''(''x'') = ''axa''⁻¹ is called 'conjugation by ''a'''. See inner automorphism, conjugacy class, conjugate closure, and conjugation of isometries in Euclidean space.

★ Topological conjugation, which identifies equivalent dynamical systems.

★ Conjugate points, in differential geometry.

★ Conjugate prior, in probability theory, a family of prior probability distributions.

★ Convex conjugate, generalization of the Legendre transformation. Also known as Legendre-Fenchel transformation or Fenchel transformation.
In the 'biosciences':

★ In biology, transmission of DNA without fusion of gametes. This includes bacterial conjugation, which takes place without fusion; conjugation in ciliates, which involves fusion of nuclei but not cells; and conjugation in certain algae and fungi, which involves fusion of cells but not filaments.

★ In immunology, a Conjugate vaccine

★ In metabolism, conjugation is a biochemical process to bind a substance to an acid and thereby deactivating its biological activity, making it water-soluble, and facilitating its excretion.
In 'chemistry':

★ a conjugate acid-base pair is one base and one acid which differ from each other by one proton (H⁺), as defined by the Brønsted-Lowry acid-base theory

★ In organic chemistry, a Conjugated system is a system of atoms covalently bonded with alternating single and multiple bonds.

★ In biochemistry: (see metabolism above)
'In physics':

★ Conjugate variables (thermodynamics), the internal energy of a system.

★ Conjugate quantities, in quantum physics, are observables that are linked by the Heisenberg uncertainty principle, such as position and momentum.