This is our Math Dictionary words that start with T page. There is a mix of hard to imagine words here and super simple words like triangle.

**Table** - a way of organizing data in columns and rows.

**Tally Mark** - a small mark used to help keep track of a count.

**Tangent** - a line that meets a smooth curve at a single point and does not cut across the curve.

**Tangent** - the secant of an angle is the ratio of the opposite side to the adjacent side.

**Tangent Line** - a line that intersects a circle or graph in just one local point.

**Tautology** - a sentence that is true because of its logical structure.

**Tens column** - the second column of numbers to the left of the decimal point.

**Terms** - individual numbers in a mathmatical operation or equation. Like terms use the same letters 5ab and 8ab. Unlike terms use different letters 7xy and 9yz.

**Tessellation** - a repeated geometric design that covers a plane without gaps or overlaps.

**Tetrahedron** - a three dimensional geometric figure (a polyhedron) that is made up of 4 equilateral triangles.

**Tetromino** - a four-square polyomino.

**Theorem** - a mathematical statement that has been proven to be true.

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**Theoretical Probability** - the chances of events happening as determined by calculating results that would occur under ideal circumstances.

**Theories of Probability** - a theory of probability is a way of understanding probability statements. That is, a theory of probability connects the mathematics of probability, which is the set of consequences of the axioms of probability, with the real world of observation and experiment.

**Toeplitz Matrix** - a matrix in which all the elements are the same along any diagonal that slopes from northwest to southeast.

**Tolerance** - the amount of error accepted in a given situation.

**Torus** - a geometric solid in the shape of a donut.

**Total** - sum, or the overall sum of numbers, or quantities, of many equations.

**Trace** - the trace of a matrix is the sum of the terms along the principal diagonal.

**Transcendental Number** - a number that is not algebraic.

**Translate** - In a tessellation, to translate an object means repeating it by sliding it over a certain distance in a certain direction.

**Transversal** - a line or ray that divides other lines or rays.

**Trapezium** - a quadrilateral in which no sides are parallel.

**Trapezoid** - a quadrilateral with exactly one pair of parallel sides.

**Triangle** - a geometric figure with three sides.

**Triangular Number** - a number of the form n(n+1)/2.

**Trigonometry** - the study of the geometry of triangles.

**Trinomial** - an algebraic expression consisting of 3 terms; a polynomial with three terms.

**Tromino** - a three-square polyomino.

**Truncated Cube** - created by truncating the tips of the cube one third of the way into each edge.

**Truncated Cuboctahedron** - created by truncating (cutting off) the cuboctahedron one third of the way into each side.

**Truncated Dodecahedron** - created by truncating (cutting off) the tips of the dodecahedron one third of the way into each edge.

**Truncated Icosahedron** - created by truncating (cutting off) the tips of the icosahedron one third of the way into each edge.

**Truncated Icosidodecahedron** - created by truncating (cutting off) the icosidodecahedron one third of the way into each side.

**Truncated Octahedron** - created by truncating (cutting off) the tips of the octahedron one third of the way into each edge.

**Truncated Pyramid** - a section of a pyramid between its base and a plane parallel to the base.

**Truncated Tetrahedron** - created by truncating (cutting off) the tips of the tetrahedron one third of the way into each edge.

**Twin Primes** - two prime numbers that differ by 2. For example, 11 and 13 are twin primes.

I know this about Math and Science, if your students understand the basic prefixes, roots, and suffixes; they'll be able to discern the meaning of more terms.

For instance the suffix tri-. Almost any word that begins with this suffix means that there are three of what the root word indicates. A triangle has three angles, a tricycle has three wheels, etc.

I went all the way through two degrees not seeing truncated cuboctahedrons (what are these doing in children's Math books?!), but at a glance I know that the word truncated means that something is cut and I can see the octa meaning eight and I'll bet that I could have gotten a multiple choice test question right just knowing these definitions.

I print and keep these Math definitions as a glossary in my binder: Free Printable Math Dictionary For Kids.

You can also download it to your tablet or bookmark the page.

See the alphabetical links below for more online Math words.

N * O * P * Q * R * S * T * U * V * W * X * Y * Z

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