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objection
a reason for disagreeing
obscure
Not well-known or hard to understand.
observer
A person who watches something.
obtain
to get or acquire something
occupation
A job or profession someone does.
occurrence
An event that happens.
offspring
The young born to a person or animal.
onset
The beginning or start of something.
onward
Moving forward in time or place.
optical
Related to vision or light.
optimal
Best or most effective under specific conditions.
optimum
Best or most suitable for a particular purpose.
oral
Related to spoken communication or the mouth.
organ
musical instrument producing sound with pipes
organism
A living thing, like a plant or animal.
orient
To align or position correctly.
orientation
a person's awareness of their surroundings
oscillation
Swinging back and forth in a regular rhythm.
outer
The outside part or surface of something.
outlet
a means of expressing or releasing something
overhead
Above or in the sky.
overlap
To cover part of something.
overview
A general summary of a topic.
oxidize
To combine with oxygen.
Vocabulary adapted from NAWL 1.2 by Charles Browne, Brent Culligan, and Joseph Phillips. Source, word list & CC BY-SA 4.0 license →