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No apostrophe is required with the 's' for decades when listed in full (e.g. 1990s). In situations where just the decade is indicated (e.g. '80s) the direction of the leading apostrophe indicates that information ahead of the number “80” has been removed (i.e. it is a contraction of 1980 in this instance).

  • 1990s
  • 1840s
  • '80s
  • 1960's
  • 20's

About the Writing Style Guide

This guide is designed to help ensure writing style – whether for internal or external audiences, written for print or online – is consistent and maintains a professional standard across the University. It is not designed for academic writing.

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Please send any feedback – including reports of errors or requests for changes – to writing.style@otago.ac.nz

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