(idiomatic) The strategic advantage afforded to a party when its opposition may be caught by surprise.

(category theory) A morphism from the terminal object to a given object (to which it is said to belong).

(astronomy) One of the parameters needed to uniquely specify a particular orbit.

Alternative form of omnielemental

(linguistics) An element of morphological analysis, usually carrying no meaning, used to connect words or stems to form compounds.

(algebra, commutative algebra, ring theory) Given a commutative unital ring R with extension ring S (i.e., that is a subring of S), any element s ∈ S that is a root of some monic polynomial with coefficients in R.

(algebra, field theory) An element that generates a simple extension.

(algebra) An element of a ring that is not a zero divisor.

(climatology) Large-scale components of the Earth climate system that may pass a tipping point.

(chemistry) A systematic name for an element, derived from the digits of its atomic number to which the suffix -(i)um is appended; normally only used for transuranic elements before or for a short period after they have been created, after which they will be given a non-systematic name.