A perfect standard of beauty, intellect etc., or a standard of excellence to aim at.
A subsemigroup with the property that if any semigroup element outside of it is added to any one of its members, the result must lie outside of it.
A subring closed under multiplication by its containing ring.
A non-empty lower set (of a partially ordered set) which is closed under binary suprema (a.k.a. joins).
A collection of sets, considered small or negligible, such that every subset of each member and the union of any two members are also members of the collection.
A Lie subalgebra (subspace that is closed under the Lie bracket) 𝖍 of a given Lie algebra 𝖌 such that the Lie bracket [𝖌,𝖍] is a subset of 𝖍.
Not actually present, but considered as present when limits at infinity are included.
Optimal; being the best possibility.
Existing only in the mind; conceptual, imaginary.
Pertaining to ideas, or to a given idea.
Perfect, flawless, having no defects.
Teaching or relating to the doctrine of idealism.
A perfect specimen, (particularly) a physically attractive person.
A card in a given suit with a value of ten.
A set or group with ten elements.
An inexact quantity, typically understood to be between 20 and 100.
A denomination of currency, such as a banknote, with a value of ten units.
A high level of intensity.
The act of rowing ten strokes flat out.
The number occurring after nine and before eleven, represented in Arabic numerals (base ten) as 10 and in Roman numerals as X.