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Related to ordering: Partial ordering
A binary relation, denoted ≤, among the elements of a set such that a ≤ b and b ≤ c implies a ≤ c, and a ≤ b, b ≤ a implies a = b ; it need not be the case that either a ≤ b or b ≤ a. Also known as order; order relation; partial ordering.
A solid-state transformation in certain solid solutions, in which a random arrangement in the lattice is transformed into a regular ordered arrangement of the atoms with respect to one another; a so-called superlattice is formed.