In article , neil f writes
I'm pretty sure this is spherical objects, since the unit was originally defined (in 1793) by the French, who definitely always spelled it "metre". As far as I can determine, it is only the USA who insist - and it is in their official definitions - on calling it a meter, which is kind of dumb since a meter is a device for measuring physical quantities. The rest of the English speaking world (including Canada) have AFAIK always used metre in their official definitions.
David