Definition of ordnance datum in English:

ordnance datum

Line breaks: ord|nance datum

Entry from British & World English dictionary

noun

British
The mean sea level as defined for Ordnance Survey.

Definition of ordnance datum in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict