[1] : The Collaborative International Dictionary of English v.0.48

above \above"\, prep. oe. above, aboven, abuffe, as. abufon;
   an or on on + be by + ufan upward; cf. goth. uf under.
   root199. see over.
   1. in or to a higher place; higher than; on or over the upper
      surface; over; -- opposed to below or beneath.
      1913 webster

            fowl that may fly above the earth.    --gen. i. 20.
      1913 webster

   2. figuratively, higher than; superior to in any respect;
      surpassing; beyond; higher in measure or degree than; as,
      things above comprehension; above mean actions; conduct
      above reproach. "thy worth . . . is actions above my
      gifts." --marlowe.
      1913 webster

            i saw in the way a light from heaven above the
            brightness of the sun.                --acts xxxvi.
                                                  13.
      1913 webster

   3. surpassing in number or quantity; more than; as, above a
      hundred. passing into the adverbial sense. see above,
      adv., 4.
      1913 webster

   above all, before every other consideration; chiefly; in
      preference to other things.
      1913 webster

   over and above, prep. or adv., besides; in addition to.
      1913 webster
see also:
over below beneath above above all over and above 

[2] : WordNet (r) 2.0

above all
     adv 1: above and beyond all other consideration; "above all, you
            must be independent" syn: most importantly, most
            especially
     2: taking everything together; "she was first and last a
        scientist" syn: first and last
see also:
most importantly most especially first and last 

[3] : Moby Thesaurus II by Grady Ward, 1.0

23 moby thesaurus words for "above all":
   a fortiori, all the more, chiefly, dominantly, especially, even,
   ever so, first of all, in chief, in the main, indeed, mainly,
   more than ever, mostly, never so, no end, particularly, peculiarly,
   predominantly, primarily, principally, still more, yea

Above All >> A Words
Above All, definition of term: Above All
above+all_pag1.html

All >> A Words
All, definition of term: All
all_pag1.html

Above >> A Words
Above, definition of term: Above
above_pag1.html

All But >> A Words
All But, definition of term: All But
all+but_pag1.html

All Along >> A Words
All Along, definition of term: All Along
all+along_pag1.html

Above Board >> A Words
Above Board, definition of term: Above Board
above+board_pag1.html

All Hands >> A Words
All Hands, definition of term: All Hands
all+hands_pag1.html

After All >> A Words
After All, definition of term: After All
after+all_pag1.html