Using Spaces in Abbreviations

Yesterday was Black Friday, the big shopping day right after Thanksgiving. We were bombarded with TV ads promising great bargains if we arrived at the mall early on Friday morning. Great! I hope everyone found some great shopping deals.

But there was pain mixed with the pleasure. Again and again I saw messages like this on TV:

Doors open at 5am.

The sale begins at 4am.

Nope. There should be a space between the numeral and a.m. or p.m.

OK, I’ll grant you that those periods in a.m. and p.m. are disappearing. But the space is still necessary in these abbreviations.

Here’s how the announcements should have looked:

Doors open at 5 am. CORRECT

The sale begins at 4 am. CORRECT


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