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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]
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. Sometimes Oceania is considered to include Australia, New Zealand, and the islands of southeast Asia.