Ok. There are not very many terms in this list, yet do you see these U words in your math glossary? Math Words That Start With U: Math Dictionary below the U words.

U.S. Customary System - a system of measurement used almost exclusively in the United States of America. (teaspoon, tablespoon, ounce, cup, pint, quart, gallon; inch, foot, yard, mile; ounce, pound, ton)

Undefined - if the denominator of a fraction is 0, then the fraction is undefined.

Undefined Slope - vertical lines that have slopes that are called undefined.

Unilateral Surface - a surface with only one side, such as a Moebius strip.

Unimodal - a finite sequence is unimodal if it first increases and then decreases.

Unimodular - a square matrix is unimodular if its determinant is 1.

Union of Sets - the set of all the objects contained by at least one of the sets. The symbol for union is U.

Unit - a single thing used as a standard or measure.

Unit Circle - a unit circle is a circle with radius 1, circle of radius 1 centered at the origin (0,0) of the Cartesian coordinate system.

Unit Cube - a cube with edge length 1.

Unit Fraction - a fraction whose numerator is 1.

Unit Square - a unit square is a square of side length 1.

Unitary Divisor - a divisor d of c is called unitary if gcd(d,c/d) = 1.

Units column - the first column of numbers to the left of the decimal point.

Unity - one

## Free Printable Math Dictionary

You can print and keep these Math definitions as a glossary in your binder or a file folder. You can also download it to your tablet or bookmark this page. See the alphabetical links below for more online Math words.

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