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opposite
Something completely different or contrary.
opposite number
someone with an equivalent position
opposition
A disagreement or resistance to something.
oppress
To keep someone down by force.
oppression
Cruel treatment or control of a group.
oppressive
Causing discomfort or distress through harsh conditions.
oppressor
A person or group that keeps others down.
opt
To make a choice or decision.
optic
Related to vision or light.
optical
Related to vision or light.
optically
In a way related to vision or sight.
optimal
Best or most effective under specific conditions.
optimally
In the best or most effective way.
optimisation
The process of making something as effective as possible.
optimism
Hopefulness about the future.
optimist
A person who expects good things.
optimistic
Having a hopeful and positive outlook.
optimization
The process of making something as effective as possible.
optimize
Make something as effective as possible.
optimum
Best or most favorable.
option
a choice or possibility to select from
optional
not required; left to choice.
optionally
By choice and not as a requirement.
optometry
The practice of eye care and vision.