If we ever share a conversation do please try to avoid the ghastly kilOMMetre.
I know of no logical or historical basis whatsoever for this pronunciation. The only similar pronunciation is micrOMMmeter, which is not a distance at all, but a device for measuring small lengths.
I will, reluctantly, and only if I like you very much, allow you to use kilOMMetre on one condition – that you’re consistent. In which case, please start practising now.
Here we go: “There are ten millIMMetres in one centIMMetre”.
Got that? Now try: “There are one thousand grams in a kilOGGram”
In Number I don’t see why I shouldn’t ask you to talk about decIMMals.
And while we’re at it, please don’t forget that “decimate” is not a synonym for devastate or anything else; it means what the root implies – to lose one-tenth of the initial quantity.