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oak a tree that belongs to the beech family and bears acorns. [2 definitions]
oar a long pole that is wide and flat at one end. Oars are used to row or steer a boat.
oasis an area in a desert where plants can grow. The plants are fed by water from a spring or well.
oat (usually plural; used with a singular or plural verb) a grain plant that is grown in cool regions. [2 definitions]
oath a serious promise. [2 definitions]
oatmeal meal made by grinding or rolling oats. [2 definitions]
obedient likely or willing to obey rules or orders.
obese very fat.
obey to follow or carry out the command, instruction, or wishes of. [3 definitions]
obi a wide sash worn at the waist over a Japanese kimono.
object anything that has shape or form and can be seen or touched. [6 definitions]
objection a statement of not liking or not agreeing with something. [2 definitions]
objectionable causing someone to object or disagree; offensive.
objective a goal or purpose that a person works to achieve; aim. [2 definitions]
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.