Words That Start With I 
Identity, Inequality, Inverse....

Welcome to a wonderful list of math words that start with I.

How many math words begin with the letter I? 

It could be a gazillion if you put the negative prefix in- in front of other Math words. Look below for most of the I Math words that I've ever used for the K-6 levels. I have kept a running list for years.

Teaching the prefix in- will help your students see that it changes the meaning of words. It depends, too, on which meaning in- is using, too.

Sometimes in- means in as a preposition as with input and inflection, but usually in Math it means not as with inequality which means not equal and infinite which means not finite.

Inter- is another good prefix to teach as with words like intersection.

List Of Math Words That Start With I

Icosahedron - a polyhedron made up of twenty equilateral triangles.

Icosidodecahedron - a polyhedron - one of the thirteen semi-regular Platonic solids. Formed by either cutting the dodecahedron one half of the way into each side or cutting the icosahedron one half of the way into each side.

Idempotent - the element x in some algebraic structure is called idempotent if x*x=x.

Identity - a number that when an operation is applied to a given number yields that given number. For multiplication, the identity is one and for addition the identity is zero.

Words That Start With Im- And In-

Imaginary Axis - the y-axis of an Argand diagram.

Imaginary Number - a complex number of the form xi where x is real and i=sqrt(-1).

Imaginary Part - the imaginary part of a complex number x+iy where x and y are real is y.

Imperfect Power - a number which is not the product of equal factors.

Improper Fraction - a simple fraction whose value is equal to or greater than one, the numerator is greater than the denominator.

Incenter - the incenter of a triangle is the center of its inscribed circle.

Incircle - the circle inscribed in a given figure.

Indefinitely - an unspecified amount, having no exact limits.

Independent Events - two events A and B are independent if the probability that they happen at the same time is the product of the probabilities that each occurs individually.

Inequality - the statement that one quantity is less than (or greater than) another.

Infinite - a list of numbers that goes on forever and ever and never stops.

Infinitesimal - a variable that approaches 0 as a limit.

Infinity - greater than any fixed counting number, or extending forever. No matter how large a number one thinks, infinity is larger than that number. Infinity has no limits.

Inflection - a point of inflection of a plane curve is a point where the curve has a stationary tangent, at which the tangent is changing from rotating in one direction to rotating in the opposite direction.

Initiator - a line-segment or figure that begins as the beginning geometric shape for a fractal. The initiator is then replaced by the generator for the fractal.

Injection - a one-to-one mapping.

Input - the number or value that is entered, for example, into a function machine. The number that goes into the machine is the input.

Inscribed Angle - the angle formed by two chords of a curve that meet at the same point on the curve.

Integer - one of the member of this set: { ... , -3, -2, -1, 0, 1, 2, 3, 4, 5, ... }, numbers that express whole units.

Interest - a sum paid for the use of money.

Math Words That Start With Inter

Intersect - two figures are said to intersect if they meet or cross each other.

Intersection - the point where two lines cross.

Intersection of Sets - a set of elements that appears in both sets.

Involution - the process of raising a number to a given power.

Irrational Number - a number whose decimal part goes on forever and ever without repeating.

Irregular Fractals - complex fractals whose dimension is often difficult to determine and in some cases is unknown.

Isogonal Conjugate - isogonal lines of a triangle are cevians that are symmetric with respect to the angle bisector. Two points are isogonal conjugates if the corresponding lines to the vertices are isogonal.

Isometry - a length preserving map.

Isosceles tetrahedron - a tetrahedron in which each pair of opposite sides have the same length.

Isosceles Trapezoid - a trapezoid whose sides are the same length (congruent.)

Isosceles Triangle - a triangle with two equal sides.

Isotomic Conjugate - two points on the side of a triangle are isotomic if they are equidistant from the midpoint of that side. Two points inside a triangle are isotomic conjugates if the corresponding cevians through these points meet the opposite sides in isotomic points.

Item - the things or objects that are the subject of a bar graph.

Iteration - repeating a set of rules or steps over and over.

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Online Math Dictionary:
Math Words

A For Abacus

B For Base

C For Celsius

D For Data

E For Equal

F For Finite

G For Graph

H For Half

I For Infinite

J For Joule

K For Kilo

L For Line

M For Matrix

N For Natural

O For Octagon

P For Parallel

Q For Quad

R For Radius

S For Square

T For Total

U For Unit

V For Venn

W For Weight

X For X-Axis

Y For Y-Axis

Z For Zero