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Index O
- O
- oblique
- oblivious of
- oblivious to
- obvious
- occur
- occurred
- occurrence
- o’clock
- oct-
- octa-
- octo-
- octopus
- octopuses
- ocul-
- odont-
- odorant
- odoriferous
- odorous
- odour
- oeno-
- offence
- offense
- offensive
- official
- officious
- offline
- off-line
- off of
- of the order of
- Oh
- OK
- O.K.
- okay
- old
- old custom
- older
- old fashion
- old fashioned
- old-fashioned
- olig-
- oligo-
- ombro-
- ombudsman (Linguistic recommendation from the Translation Bureau)
- omni-
- ON
- on (1)
- on (2)
- on account of
- on behalf of
- onco-
- one
- one of those who
- on foot
- online
- on-line
- on numerous occasions
- onoma-
- onomato-
- Ont.
- Ontarian
- Ontario
- on the basis of
- on the diagonal
- on the one hand
- on the order of
- on the other hand
- on the part of
- on to
- onto
- onward
- onwards
- oo-
- opposite from
- opposite of
- opposite to
- opposition (in)
- opt-
- opthalm-
- opthalmo-
- opto-
- oral
- order
- ordinance
- ordnance
- ori-
- orient
- orientate
- original founder
- originate at
- originate from
- originate in
- originate with
- ornitho-
- oro-
- osseo-
- ossi-
- osteo-
- oto-
- Ottawa
- Ottawan
- out-
- outside of
- ov-
- over
- over all
- overall
- overlook (1)
- overlook (2)
- oversee
- oversight
- overused cliché
- ovi-
- ovo-
- owing to
- owing to the fact that
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O, Oh
Both O and Oh are relatively rare in everyday writing, but may appear in titles or dialogue.
Capitalize O when formally addressing a person or thing. No punctuation is needed with O.
- The students sing "O Canada" as loudly as possible every morning.
- "O wild West Wind, thou breath of Autumn’s being ..." is the opening line of Shelley’s "Ode to the West Wind."
The interjection or exclamation Oh is followed by a comma, exclamation mark or em–dash.
- Oh, no! I’ve dropped my keys down the elevator shaft.
- Oh! The northern lights are amazing tonight!
- Oh—are you really going to Nunavut for your summer holiday?
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