(analytic geometry, projective geometry) A complex line (especially, the set of complex numbers regarded as such) endowed with a point at infinity (thus becoming a projective line); (more formally) the set of equivalence classes of ordered pairs (α, β) of complex numbers, not both zero, with respect to the equivalence relation "(α, β) ≡ (λα, λβ) for all nonzero complex λ".

The totality of businesses such as wedding planners, bridal registries, specialized caterers, bridal wear stores, etc. that exist for assisting with holding a wedding.

(inorganic chemistry) A complex, typically of a transition element, in which the hybridization of the central metal atom utilizes d orbitals from the shell inside that of the outermost occupied shell

(mathematics) An element of the two-dimensional algebra over the field of real numbers which contains an element ȷ ≠ 1 satisfying ȷ² = 1.

The socioeconomic combination of prisons and the private businesses that supply them with goods and services.

(inorganic chemistry) A coordination compound consisting of a metal cation surrounded by a fixed number of water ligands

(immunology) A structure, typically formed on the surface of a pathogen cell membrane as a result of the activation of the host's complement system, creating transmembrane channels that disrupt the cell membrane, leading to cell lysis and death.

(pathology) A transcription disorder that causes failures of expression causing the lack of advancement in development from the state found as a neonatal resulting from genetic anomalies. A developmental disorder that is a state of permanent neoteny, staying in the state of an infant.

plural of superior olivary complex

(neuroanatomy, anatomy) A collection of brainstem nuclei involved in hearing.