Lexical Definition

‎διάγνωσις‎ diágnōsis (dee-ag'-no-sis) decision ^G:N-F
from ‎διαγινώσκω‎

hearing.

• (magisterial) examination ("diagnosis")

Abbott-Smith

** διά-γνωσις, -εως, ἡ (< διαγιγνώσκω), [in LXX: Wi 3:18 * ;]
1. a distinguishing, also as medical term.
2. As law-term (Lat. cognitio), determination, decision: Ac 25:21 (Cremer, 674).†

Abbott-Smith References

Liddell-Scott-Jones

διάγνωσις-γνωσις, εως, ἡ,

distinguishing, τὴν δ. ποιεῖσθαι ὁποῖοι ἐκράτουν ἢ ἐκρατοῦντο [Refs 5th c.BC+]; means of distinguishing or discerning, [Refs 5th c.BC+]; of medical diagnosis, δ. ποιεῖσθαι [Refs 5th c.BC+]

__2 power of discernment, [Refs 5th c.BC+]
__II resolving, deciding, δ. ποιεῖσθαι [Refs 5th c.BC+]; δ. τῆς ἀξίας ποιεῖσθαι to determine the value, [Refs 5th c.BC+]; = Latin cognitio, [NT+2nd c.AD+]; ἐπὶ διαγνώσεων τοῦ Σεβαστοῦ, = Latin a cognitionibus Augusti, [Refs 3rd c.AD+]

_{LSJ Scripture Refs: Acts.25.21}