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I often hear US citizens say something like this:

<Some phrases>. Period.

What does period mean when it appears in a sentence by itself in this type of situation?

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    In Britain they say "full stop" and not "period". With the same meaning, as explained in the answers.
    – GEdgar
    Jun 1, 2012 at 18:15
  • @GEdgar, Really? That's interesting... I never knew that.
    – JLG
    Jun 1, 2012 at 18:26
  • @GEdgar: Many Brits now say "End of" in this context (i.e. - "End of story", "No further discussion").
    – FumbleFingers
    Jun 1, 2012 at 21:15
  • @GEdgar, I knew the period was called a full stop, but I don't think I've ever heard (or read) a sentence like (to borrow from Clark Kent), "Phones should only be used for communication, full stop." Is that what you meant? British people say that? (I wish I could find a video of that, but couldn't seem to.)
    – JLG
    Jun 2, 2012 at 0:34
  • I guess Black-Adder is considered British? So maybe there is a video of this scene somewhere: suslik.org/Humour/FilmOrTV/BlackAdder/ba2-6.html
    – GEdgar
    Jun 2, 2012 at 0:43

3 Answers 3

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Period at the end of the sentence means, the things said in the sentence are definite and no change is allowed.

For example, "I want the document without any errors, period" meaning that there should not be any errors in the document.

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A period is what the full stop is called in American English. Saying period at the end of a sentence is a way of expressing the finality of what is being said. For example,

A: But phones are good for taking pictures.

B: No, I don't think so. Phones should only be used for communication, period.

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  • Moreover, your final word period there can be rewritten as full stop without any change in meaning whatsoever.
    – tchrist ♦
    Jun 2, 2012 at 0:58
  • @tchrist: Except possibly confusing some American listeners. "Full stop" tends to sound more like something from an old-timey telegram. "NO I DONT THINK SO STOP TELEGRAPHS SHOULD ONLY BE USED FOR COMMUNICATION FULL STOP SIGNED NATE ELDREDGE"
    – Nate Eldredge
    Jun 2, 2012 at 3:47
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    @NateEldredge Are we really that confusable these days?
    – tchrist ♦
    Jun 4, 2012 at 10:37
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    @tchrist & Nate, some of us are. :) I'd have at least given you the crooked head look for "full stop".
    – TecBrat
    Sep 5, 2012 at 3:27
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In your example, period is used as an interjection. As the Wiktionary explains:

Interjection
1) (chiefly North America) And nothing else; and nothing less; used for emphasis.

When I say "eat your dinner," it means "eat your dinner," period!

You usually use it to end a sentence/statement/command which you don't want to discuss/negotiate further.

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