Math Words That Start With O

Our printable Math Dictionary words that start with O has the all the Math terms that begin with the letter O that I have found in the many years I have been using kids Math glossaries.

If you teach the vocabulary meaning of the prefixes ob- and oct-, the children will learn this list quickly.

Math Words That Start With O: Math glossaries sometimes miss some of these words.Math Words That Start With O: Free printable Math Dictionary below.

List Of Words That Start With O

Words That Start With Ob-

Oblate Spheroid - an ellipsoid produced by rotating an ellipse through 360º about its minor axis.

Oblique - slanting or sloping not horizontal or vertical.

Oblique Angle - an angle whose measure is greater than 90 degrees.

Oblique Coordinates - a coordinate system in which the axes are not perpendicular.

Oblique Lines - those which approach each other, and will meet if sufficiently produced.

Oblique Prism - one whose sides do not form 90 degree angles with the bases.

Oblique Triangles - a triangle whose measure is greater than 90 degrees.

Obtuse Angle - an angle larger than 90º but smaller than 180º.

Obtuse Triangle - a triangle that has one angle that is greater than 90 degrees.

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Words That Start With Oct-

Octagon - an eight sided polygon.

Octahedron - a 3 dimensional geometric figure (a polyhedron) that is made up of 8 equilateral triangles.

Octant - any one of the 8 portions of space determined by the 3 coordinate planes.

More Math Terms That Begin With O

Odd Function - a function f(x) is called an odd function if f(x)=-f(-x) for all x.

Odd Number - an integer that is not evenly divisible by 2.

One to One - a function f is said to be one to one if f(x)=f(y) implies that x=y.

Onto - a function f is said to map A onto B if for every b in B, there is some a in A such f(a)=b.

Open Interval - an interval that does not include its two endpoints.

Optical Illusion - a drawing or object that appears to have an effect that it does not really have.

Order of Operations - tells which order of operations used to solve math problems: (1) Parenthesis (2) Exponents (3) Multiplication & Division (4) Addition (5) Subtraction. (Please Excuse My Dear Aunt Sally.)

Ordered Pair - a set of two numbers in the form: (x, y).

Ordinal Number - a number indicating the order of a thing in a series.

Ordinate - the y-coordinate of a point in the plane.

Origin - the point at which the horizontal and vertical axes intersect, at zero (0,0).

Orthic Triangle - the triangle whose vertices are the feet of the altitudes of a given triangle.

Orthocenter - the point of intersection of the altitudes of a triangle.

Outcome - any one of the possible results of an experiment.

Outcome Space - the set of all possible outcomes of a given experiment.

Outlier - a data point (or points) that lie far outside most of the rest of the points in the data set.

Outlier - a number in a list of data that is distant from the other numbers in the list.

Output - the number or value that comes out from a process. P0=0, P1=1, and Pn=2Pn-1+Pn-2. 

Printable Math Dictionary

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.

A   B   C   D   E   F  

G   H   I   J   K   L   M 

N   O   P   Q   R   S   T 

 U   V   W   X   Y   Z 

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Mary Fifer, BSBA is webmaster, author, and researcher at PrintNPractice.com. She has created elementary school practice exercises using digital interactive worksheets. Printable and perfect for today's teachers, tutors, homeschoolers, and students!

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