undecagon a polygon with 11 sides
undecahedron is a polyhedron having 11 faces
undefined when an expression has no value or meaning, it is said to be undefined. Division by zero is undefined
unequal ‚Ȇ when two things are not equal
unhappy number a number that is not happy. See happy number
unimodal a distribution with a single unique mode
unit measurements are usually given in standard units. A metre is a standard unit of length. A kilogram is a standard unit of weight.
unit another name for one. A unit square is a square of side length one

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