o/b

o/​b o/​b

written abbreviation for 'on or before', used before a date that is the latest possible date that a bill can be paid or goods can be delivered

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o/b UK US preposition

► WRITTEN ABBREVIATION for on or before: used before a date in a document, invoice, etc. to show that the date shown is the last acceptable date for something to be paid or done: »

Investments must be received o/b April 5.