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Children's Dictionary
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occupant someone who lives or works in a place or fills a position.
occupation the work a person does to earn a living; profession. [5 definitions]
occupy to take and control. [4 definitions]
occur to take place; happen. [3 definitions]
occurrence the process or fact of taking place or happening. [2 definitions]
ocean the vast body of salt water covering about three quarters of the earth's surface. [2 definitions]
Oceania the region of the earth that includes all the islands of the central, western, and southern Pacific Ocean. Oceania includes many small island nations such as Fiji, Tonga, Kiribati, Solomon Islands, and Vanuatu. Sometimes Oceania is considered to include Australia, New Zealand, and the islands of southeast Asia.
oceanography the science that studies the oceans and the animals and plants that live in oceans.
ocelot a wild cat with yellow or brown fur and black spots or stripes. Ocelots look like leopards but are smaller. They live in South and Central America, sometimes as far north as Texas. They are carnivorous mammals that eat birds, snakes, and small mammals.
o'clock of or according to the clock.
Oct. abbreviation of "October."
oct- see "octo-."
octagon a flat closed figure with eight straight sides.
octave a musical tone with the same name as another, higher or lower tone. When a tone is played with its octave, the tones blend together and sound almost like a single note. The higher of the tones in an octave always has twice as many vibrations per second as the lower note. [2 definitions]
octo- a prefix that means "eight."
October the tenth month of the year. October has thirty-one days.
octopus a sea animal with a soft, rounded body and eight long tentacles. Octopuses are carnivores that eat crabs, lobsters, and other small sea animals. They are mollusks and are closely related to squids.
odd different from what is expected or usual; strange. [4 definitions]
oddity a strange or unusual thing, person, or event. [2 definitions]
odd number a whole number that cannot be divided exactly by 2.
odds the probability that one thing is more likely to happen than another. [2 definitions]