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obligate	to make someone do something because of a law or moral principle.
obligation	something that someone should or should not do because of a law or moral principle. [2 definitions]
oblige	to make (someone) feel bound to do something or to act in a certain way. [3 definitions]
obliging	ready to help or do favors.
oblique angle	an angle that is not a right angle.
oblong	longer than it is wide. [2 definitions]
obnoxious	offensive or not pleasant.
oboe	a woodwind instrument with a high tone. It has a long, thin body with finger holes or keys, and is played by blowing into a mouthpiece.
obscene	offensive and not decent.
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.

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