## List of Math Words That Start With O

Below are common math words that start with o.

- Octagon
- Obtuse
- Operand
- Operation
- Odd
- Outcome
- Orthogonal
- Oblique
- Origin
- Odd number
- Ordinate
- Ounce
- Octave
- Onto
- Odd function
- Order
- Operator
- One-to-one
- Outlier
- Oscillation
- Orthocenter
- Orthogonal matrix
- Oscillatory
- Observations
- Ordered pair
- Oblique angle
- Overestimate
- Odd permutation
- Ordinal number
- Overlapping
- Orthogonal complement
- Open set
- Onto function
- Orthocenter theorem
- Octahedron
- Outcome space
- Odd multiple
- Overlapping circles
- Ordinary differential equation
- Oscillatory behavior
- Objective function
- Orthogonal projection
- Open interval
- One-to-one correspondence
- Overdetermined system
- Overlapping events
- Orthogonal vectors
- Octillion
- Overhead projector
- Order of magnitude

## Math Terms That Start With O (Divided by Subjects)

### Geometry Terms That Start With O

**Obtuse Angle:**Angle greater than 90 degrees but less than 180 degrees.**Octagon:**An eight-sided polygon with equal angles.**Orthocenter:**Point where altitudes of a triangle intersect.**Oval:**Rounded, elongated shape resembling an ellipse.**Oriented Angle:**Angle with direction for rotation measurement.**Oblate Spheroid:**Spherical shape slightly flattened at poles.**Opposite Side:**Side opposite to a given angle in a triangle.**Orthogonal Matrix:**Matrix whose transpose is its inverse.**Outlier:**Data point significantly different from others.**One-Point Perspective:**Linear perspective drawing with one vanishing point.

### Algebra Terms That Start With O

**Ordered Pair:**Pair of numbers representing a point in a coordinate system.**Origin:**Point (0, 0) in a coordinate plane.**Octagon:**Polygon with eight sides and angles.**Operation:**Mathematical action like addition, subtraction, etc.**Odd Number:**Integer not divisible by 2.**Orthogonal:**Perpendicular or at a right angle.**Outlier:**Data point significantly different from others in a set.**One-to-One Function:**Each input maps to a unique output.**Obtuse Angle:**Angle greater than 90 degrees but less than 180 degrees.**Onto Function:**Every element in the range has a corresponding element in the domain.

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