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The Collaborative International Dictionary of English v.0.48 (gcide)

M \M\, n.
1. (Print.) A quadrat, the face or top of which is a perfect
square; also, the size of such a square in any given size
of type, used as the unit of measurement for that type:
500 m's of pica would be a piece of matter whose length
and breadth in pica m's multiplied together produce that
number. [Written also {em}.]
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2. (law) A brand or stigma, having the shape of an M,
formerly impressed on one convicted of manslaughter and
admitted to the benefit of clergy.
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{M roof} (Arch.), a kind of roof formed by the junction of
two common roofs with a valley between them, so that the
section resembles the letter M.
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'Em \'Em\
An obsolete or colloquial contraction of the old form hem,
them. --Addison.
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Em \Em\, n. (Print.)
The portion of a line formerly occupied by the letter m, then
a square type, used as a unit by which to measure the amount
of printed matter on a page; the square of the body of a
type.
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Em- \Em-\
A prefix. See {En-}.
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