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Olympus a mountain in northern Greece, believed in ancient times to be the place where the gods lived; Mount Olympus.
Oman a country on the Indian Ocean northeast of Yemen and east of Saudi Arabia. The capital of Oman is Muscat.
omelet a food made from beaten eggs that are cooked into a single sheet and often folded over a filling of vegetables, meat, or cheese.
omen something that is believed to be a sign of future good or evil.
ominous giving a sign of future evil or trouble.
omit to leave out; not include.
omnivore an animal that lives on a diet of both plant and animal food.
omnivorous living on a diet of both plant and animal food.
on above and supported by. [20 definitions]
on account of because of.
on a dime (informal) with great quickness or accuracy.
on and on for too long a time.
on an even keel in balance or stable.
once at one time in the past; formerly. [4 definitions]
oncoming coming toward or near; approaching.
on deck next in line to bat in a baseball game.
one being a single thing or person. [8 definitions]
on edge nervous or anxious; full of worry.
oneself a person's own self (used to show that an action is done to the same person who does that action).
one-sided giving only one side or position. [2 definitions]
one-way moving or allowing to move in a single direction.