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Children's Dictionary
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obscure hard to see or not distinct. [4 definitions]
observation the act or an instance of perceiving the environment through one of the senses. [3 definitions]
observatory a building that has equipment for studying the sun, moon, planets, and stars.
observe to notice or see. [5 definitions]
observer someone who watches and listens at an event such as a meeting but does not participate in it.
obsolete no longer in use.
obstacle something that stops forward movement or progress.
obstinate not willing to change one's ideas; stubborn.
obstruct to block or clog. [3 definitions]
obstruction something that blocks the way or prevents progress. [2 definitions]
obtain to get; gain.
obtuse angle an angle greater than 90 degrees and less than 180 degrees.
obvious easily seen or understood; clear.
obviously in a way that is easy to see or understand; clearly.
occasion an event or the time at which it happens. [3 definitions]
occasional happening now and then or not too often.
occasionally at times; now and then; not frequently.
occupant someone who lives or works in a place or fills a position.
occupation the work a person does to earn a living; profession. [3 definitions]
occupy to take and control. [4 definitions]
occur to take place; happen. [3 definitions]