1) exact, careful
2) of the strictest sect: the most precise and rigorous in interpreting the Mosaic law, and in observing even the more minute precepts of the law and tradition
Part of Speech: adjective
Superlative of ἀκριβης akribês (a derivative of the same as G206); most exact: - most straitest.
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 ἀκριβής; click on the second column to search for that grammatical form of the root ἀκριβής; click on the third column to search for that word and grammatical form; click on the total to search for the root ἀκριβής.