Mega definition

megə
Large.

Megadose.

prefix
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(informal) Great in size, quantity, etc., often in relation to others of its kind.
adjective
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Large, great, powerful.

Megacephalic, megaphone.

affix
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One million (106 ).

Megahertz.

prefix
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One million; the factor 106

Megahertz, megaton.

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Huge in size, number, etc.

A mega-yacht.

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To an enormous degree.

Mega-popular.

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Large, as in megadose, a large dose.
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One million, as in megahertz, one million hertz.
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220 (that is, 1,048,576), which is the power of 2 closest to a million, as in megabyte.
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(1) Million (10 to the 6th power). Abbreviated "M," it is a prefix for capacities and speeds (megabits, megabytes, megahertz, etc.). Mega may refer to 1,000,000 or 1,048,576, the latter based on the binary system (see NIST binary). See MB, meg, binary values and space/time.
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See M.
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(informal) Very large.
adjective
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(slang, 1990s) Great; excellent.
adjective
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(originally) Very large, great. Denoting a size larger than usual.
prefix
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In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by one million (106.) SI Symbol: M, computing abbreviation: Mi.
prefix
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(computing) Multiplying the unit to which it is attached by 220 (= 1,048,576, the binary round number closest to a million).
prefix
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(computing, marketing) Multiplying the unit to which it is attached by 210 × 103 (= 1024,000, the binary round number closest to thousand).
prefix
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Surpassing other examples of its kind; extraordinary.

Megahit.

prefix
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1,048,576 (220 ).

Megabyte.

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A prefix that means.
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Origin of mega

  • Gr mega- < megas, great, mighty: see much

    From Webster's New World College Dictionary, 5th Edition

  • Greek from megas great meg- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Ancient Greek μέγας (megas, “great, large, mighty"), from Proto-Indo-European *meǵhâ‚‚s (“great"). Cognate with Latin magnus, and with Germanic words: Gothic 𐌼𐌹𐌺𐌹𐌻𐍃 (mikils), Old English micel, Middle English muchel, English much, Old High German mihhil, Old Norse mikill, Danish meget.

    From Wiktionary

  • From the prefix mega-.

    From Wiktionary