Frequently
Occurs or done often.
Example: the bus stops frequently to pick up passengers
- ordinal number
- ordinary differential equation
- ordinate
- origin
- origin symmetry
- orthocenter
- orthogonal
- oscillating series
- ounce
- outcome
- outlier
- oval
- ovoid
- pair
- palindrome
- palindromic numbers
- parabola
- paraboloid
- parallel
- parallel lines
- parallel planes
- parallelepiped
- parallelogram
- parameter
- parametric equations