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meta    音标拼音: [m'itə]
变换,改变,在后的

变换,改变,在後的

meta


Meta- \Met"a-\, Met- \Met-\ [Gr. meta` between, with, after;
akin to AS. mid with, G. mit, Goth. mi[thorn], E. mid, in
midwife.]
1. A prefix meaning between, with, after, behind, over,
about, reversely; as, metachronism, the error of placing
after the correct time; metaphor, lit., a carrying over;
metathesis, a placing reversely.
[1913 Webster]

2. (Chem.) A prefix denoting:
(a) Other; duplicate, corresponding to; resembling; hence,
metameric; as, meta-arabinic, metaldehyde.
(b) (Organic Chem.) That two replacing radicals, in the
benzene nucleus, occupy the relative positions of 1
and 3, 2 and 4, 3 and 5, 4 and 6, 5 and 1, or 6 and 2;
as, metacresol, etc. See {Ortho-}, and {Para-}.
(c) (Inorganic Chem.) Having less than the highest number
of hydroxyl groups; -- said of acids; as,
metaphosphoric acid. Also used adjectively.
[1913 Webster]

3. A prefix meaning at a level above, as in metaphysics,
metalanguage.
[PJC]

/me't*/ or /may't*/ or (Commonwealth) /mee't*/ A
prefix meaning one level of description higher. If X is some
concept then meta-X is data about, or processes operating on,
X.

For example, a {metasyntax} is {syntax} for specifying syntax,
{metalanguage} is a language used to discuss language,
{metadata} is data about data, and {meta-reasoning} is
reasoning about reasoning.

This is difficult to explain briefly, but much hacker humour
turns on deliberate confusion between meta-levels.

[{Jargon File}]

(1999-04-06)

meta: /me´t@/, /may´t@/, /mee´t@/, pref. [from analytic philosophy] One level of description up. A
metasyntactic variable is a variable in notation used to describe syntax,
and meta-language is language used to describe language. This is difficult
to explain briefly, but much hacker humor turns on deliberate confusion
between meta-levels. See hacker humor.


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