British English to American English: Letter O
OAP (Old-Age Pensioner) Senior Citizen (Senior cit.)
Ochre Ocher
Octillion BE n+48 zeros Octillion AE n+27
Octodecillion BE n+108 zeros Octodecillion AE n+57 zeros
Odds on [betting] = better than even
Odour Odor
Oedema Edema
Oesophageal Esophageal
Oesophagus Esophagus
Oestrogen Estrogen
Off licence/wine merchant Liquor store
Offence Offense
Offenceless Offenseless
Oftener More often
Old Age Pensioner/OAP Senior Citizen
Old boy/girl network =
Omelette Omelet
O.n.o = or nearest offer
On (people ~ a/the course) In (people ~ a/the course)
One/Oneself One/Oneself (not widely used in US)
One-off (adj.) One-time (adj.)
On offer On sale
Operating theatre Operating room
Orchestra pit Parquet (theater)
Ordinary share Share of Common stock
Ordinary stock common stock
Orientate (v.) Orient (v.)
Orientated Oriented
Organisation Organization
Organisers Organizers
Orthopaedics Orthopeadics
Opposite (location) Across from (location)
Optimise Optimize
Optrician Optometrist
Organise Organize
Osteopath/Chiropractor Chiropractor
Ostracise Ostracize
Outmanoeuvre Outmaneuver
Oven mitts Potholders
Overalls/Dungerees Overalls
Overdraft =
Overhead lockers Overhead bins
Overhead railway Elevated railroad
Overtake Pass
Oxidise Oxidize
Have I missed anything? Send in your American/British differences now.
