'above all' definitions:

Definition of 'above all'

(from WordNet)
adverb
Above and beyond all other consideration; "above all, you must be independent" [syn: above all, most importantly, most especially]
adverb
Taking everything together; "she was first and last a scientist" [syn: first and last, above all]

Synonyms of 'above all'

From: Moby Thesaurus