διά-γνωσις, -εως, ἡ (< διαγιγνώσκω), [in LXX: Wis.3:18 * ;] __1. a distinguishing, also as medical term. __2. As law-term (Lat. cognitio), determination, decision: Act.25:21 (Cremer, 674).† (AS)
Thayer:
1) to distinguish 2) in a legal sense, examination, opinion, decision
διάγνωσις
diagnōsis
dee-ag'-no-sis
From G1231; (magisterial) examination (“diagnosis”)