Skip to main content
Join the Movement to Make Math Meaningful!
Log In
Account
Get Started
Meaningful Math
Resources
Videos
Workshops
Articles
Math Dictionary
Podcasts
SEARCH MATH CONCEPTS A-Z
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
Math Dictionary - O
TOPIC
Addition & Subtraction
Counting & Cardinality
Family Connection
Fractions & Geometry
Measurement & Data
Multiplication & Division
Place Value & Base Ten
Vocabulary & Discourse
GRADE
First Grade
Kindergarten
Second Grade
Third Grade
SUBMIT
DEFINITION
Obtuse Angle
DEFINITION
Obtuse Triangle
DEFINITION
Octagon
DEFINITION
Odd
DEFINITION
Ones
DEFINITION
Open Number Line
DEFINITION
Operation
DEFINITION
Order of Operations
DEFINITION
Ordinal Number
DEFINITION
Ounce
DEFINITION
Oval
