extraordinarily great in size, amount, or intensity: a tremendous ocean liner; tremendous talent.
extraordinary in excellence: a tremendous movie.
dreadful or awful, as in character or effect; exciting fear; frightening; terrifying.

1625–35; < Latin tremendus dreadful, to be shaken by, equivalent to trem(ere) to shake, quake + -endus gerund suffix

tremendously, adverb
tremendousness, noun
untremendous, adjective
untremendously, adverb
untremendousness, noun

1. See huge. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tremendous (trɪˈmɛndəs)
1.  vast; huge
2.  informal very exciting or unusual
3.  informal (intensifier): a tremendous help
4.  archaic terrible or dreadful
[C17: from Latin tremendus terrible, literally: that is to be trembled at, from tremere to quake]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1632, "awful, dreadful, terrible," from L. tremendus "fearful, terrible," lit. "to be trembled at," gerundive form of tremere "to tremble" (see tremble). Hyperbolic or intensive sense of "extraordinarily great or good, immense" is attested from 1812, paralleling semantic
changes in terrific, terribly, awfully, etc.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The rain is terrific for the weeds, which continue to pop up all over the test
  garden at a tremendous pace.
Mozzarella came to mind first, because it's so tremendous with ripe tomatoes
  and basil.
But to hold an egg that actually contains nascent life is quite another matter,
  a tremendous responsibility.
There is this tremendous sense of energy and ambition and idealism that the
  world and the future is theirs.
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