1) on the instant, forthwith
Part of Speech: adverb
From G1537 and the genitive singular feminine of G846 (G5610 being understood); from that hour, that is, instantly: - by and by, immediately, presently, straightway.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ἐξαυτῆς; click on the second column to search for that grammatical form of the root ἐξαυτῆς; click on the third column to search for that word and grammatical form; click on the total to search for the root ἐξαυτῆς.