C4
1
7.0
An envelope that fits an unfolded A4 sheet
- noun
- Specialized
:
C4
- She preferred to use C4 envelopes for mailing her important papers because they fit A4 size perfectly.
Examples
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The letter was carefully placed in a C4 envelope to ensure it arrived unfolded.
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We need to buy some C4 envelopes to send our documents without folding them.
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The 89 C4 stays with me.
Blog text (14) -
Even the C4 used was bought by an untraceable dummy corporation.
Fiction book (1996) -
Locke took the C4 off the plane and put it in the backpack, which went into the sub.
Blog text (4) -
tonyman262: I have an 89 C4 and an 07 C6, both white.
Blog text (14)
How Big
Surface Forms
Etymology
C4 for an envelope comes from the international paper and envelope sizes: C is the envelope series and the number matches the paper size it holds, so C4 is made to hold an A4 sheet 'without folding'.