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Children's Dictionary
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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.