Lexical Definition

‎ἐπίσταμαι‎ epístamai (ep-is'-tam-ahee) to know/understand G:V
apparently a middle voice of ‎ἐφίστημι‎ (with ‎νοῦς‎ implied)

know, understand.

Usage: 27 forms in 66 verses
Form Translated As     In Verse(s)
ἐπιστάμενοσ knowing Acts.18.25Acts.24.101Tim.6.4Heb.11.8
ἐπίσταται Understands Acts.26.26
ἐπίστασθε know Acts.10.28Acts.15.7Acts.20.18
you know Acts.19.25Jas.4.14
ἐπίστανται know Acts.22.19
they understand Jude.1.10
ἐπίσταμαι I am acquainted with Acts.19.15
understand Mark.14.68
ηπιστάμην have knowledge LXX.Num.22.34
ηπίστω knowledge of LXX.Deut.28.64
were knowing of LXX.Isa.48.8
ηπίσταντό made acknowledgment LXX.Jer.2.8
ηπίσταντο they had no knowledge of LXX.Deut.29.26
επιστώνται should have knowledge of LXX.Isa.41.20
επισταμένω having knowledge of LXX.Isa.29.11
επισταμένου having knowledge of LXX.Isa.29.12
επιστάται knowers LXX.2Chr.34.13
επιστάμην I had no knowledge LXX.Job.42.3
επιστάμενοσ having knowledge of LXX.Num.24.16LXX.Job.7.20
επιστάμενον having knowledge LXX.2Chr.2.7
επιστάμενοι O ones having knowledge LXX.Job.34.2
having knowledge LXX.1Kgs.9.23
ones having knowledge of LXX.Num.32.11
επιστάμενοί knowing LXX.Ezek.28.19
επίστησθε you should know LXX.Josh.3.4
επίστη do you know LXX.Deut.22.2
have knowledge of LXX.Num.20.14
know LXX.Josh.14.6
you should have knowledge LXX.Gen.47.6
you should have knowledge of LXX.Job.38.4
επίσταται And he knows LXX.Job.37.16
has knowledge LXX.Prov.15.2LXX.Prov.29.7
have knowledge of LXX.Prov.9.13LXX.Prov.10.21
he knows not LXX.Job.14.21
επίστασθε know LXX.Job.13.2LXX.Ezek.17.12
επίστασαι And do you know LXX.Job.38.33
have knowledge of LXX.Jer.17.16
know LXX.Ezek.37.3
knowledge of LXX.Deut.28.33LXX.Deut.28.36
you know LXX.Deut.20.20LXX.Job.38.20
επίστανται have knowledge of LXX.Prov.14.22
επίστανταί have no knowledge of LXX.Isa.55.5
επίσταμαι I know LXX.Exod.4.14LXX.Exod.9.30LXX.Josh.2.9LXX.Job.32.22
have knowledge of LXX.Isa.29.12
know LXX.Deut.31.27LXX.Josh.2.5LXX.Isa.37.28LXX.Isa.66.18LXX.Jer.1.6LXX.Ezek.11.5
επίσταμαί I knew LXX.Jer.1.5

Abbott-Smith

ἐπίσταμαι (prob. an old mid, of ἐφίστημι, q.v.), [in LXX chiefly for יָדַע ;]
to know, know of, understand: c. acc pers., Ac 19:15; c. ptcp., ib. 24:10; c. acc rei, Mk 14:68, Ac 18:25, I Ti 6:4, Ja 4:14, Ju 10; seq. περί, Ac 26:26; ὅτι, ib. 15:7 19:25 22:19; ὡς, ib. 10:28; πῶς, ib. 20:18; ποῦ, He 11:8.†
SYN: γινώσκω (q.v.), οἶδα

Abbott-Smith References

Book Refs
Mark 14:68
Acts 10:28 · 15:7 · 18:25 · 19:15 · 19:25 · 20:18 · 22:19 · 24:10 · 26:26
1 Timothy 6:4
Hebrews 11:8
James 4:14
Jude 1:10

Liddell-Scott-Jones

ἐπίσταμαι, 2

person -ασαι[Refs 6th c.BC+], contraction ἐπίστω [Refs 5th c.BC+]; subjunctive Ionic dialect ἐπιστέωμαι [Refs 5th c.BC+], Attic dialect ἐπίστωμαι [Refs 5th c.BC+]: imperfect ἠπιστάμην [Refs 8th c.BC+]; Ionic dialect 3rd.pers. plural ἠπιστέατο or ἐπιστέατο [Refs]: future ἐπιστήσομαι [Refs 8th c.BC+]: aorist 1 ἠπιστήθην [Refs 5th c.BC+]

__I. know how to do, be able to do, capable of doing, c.infinitive, οὐδέ οἱ ὀστέ᾽ ἐπιστήσονται Ἀχαιοὶ ἀλλέξαι [Refs 8th c.BC+]; and of artistic skill, ὃς χερσὶν ἐπίστατο δαίδαλα πάντα τεύχειν [Refs 8th c.BC+]: frequently in Trag. and Attic dialect, οὔπω σωφρονεῖν ἐπίστασαι [Refs 5th c.BC+]; κιθαρίζειν οὐκ . [Refs 5th c.BC+]infinitive, σῷζ ὅπως ἐπίστασαι as best you can, [Refs 4th c.BC+]
__I.2. to be assured, feel sure that.., τοῦτον ἐπίστανται πλεῖστα εἰδέναι [Refs 5th c.BC+]
__II. with accusative, understand a matter, know, be versed in or acquainted with, πολλὰ δ᾽ ἐπίστατο ἔργα [Refs 8th c.BC+]; ἔγωγε γράμματ᾽ οὐδ᾽ . [Refs 5th c.BC+]; τὸ μὴ . γράμματα illiteracy, [Refs 1st c.BC+]; . ἱερατικὰ καὶ Αἰγύπτια γράμματα [Refs 2nd c.AD+]; . μύθους τοὺς Αἰσώπου know them by heart, [Refs 5th c.BC+] adverb, Συριστὶ . know Syrian, [Refs 5th c.BC+]; with accusative and infinitive conjoined, [Refs 4th c.BC+]; with infinitive to explanation the accusative, ἔργον δὲ μοῦνον ἐσθίειν . [Refs 7th c.BC+]
__II.2. after [Refs 8th c.BC+], know as a fact, know for certain, ἐπισταμένοισι εὖ οὐκ ἄν τις λέγοι [Refs 5th c.BC+]; used convertibly with εἰδέναι, [Refs 5th c.BC+]; even χάριν ., ={χάριν εἰδέναι}, [Refs 4th c.AD+] being confined to scientific knowledge (ἐπιστήμη), διὰ τὸ εἰδέναι τὸ ἐπίστασθαι ἐδίωκον [Refs 4th c.BC+]. Hdt.[same place]; σαφῶς . [Refs 6th c.BC+]; . ὅτι.., or . τοῦτο, ὅτι.., [Refs 5th c.BC+]
__II.3. rarely, know a person, Ἀρίγνωτον γὰρ οὐδεὶς ὅστις οὐκ . [Refs 5th c.BC+]; τὸν Ἰησοῦν γινώσκω καὶ τὸν Παῦλον . [NT]; but παῖς τοὺς τεκόντας οὐκ . does not know who they are, [Refs 5th c.BC+]
__III. with participle, in Prose and Trag., know that one is, has, etc., εὖ . αὐτὸς σχήσων [Refs 5th c.BC+]; also ὡς ὧδ᾽ ἐχόντων τῶνδ᾽ . σε χρή [Refs 5th c.BC+]; ὡς φανέν γε τοὔπος ὧδ᾽ . [Refs 1st c.AD+]: c.accusative et infinitive, [Refs 5th c.BC+]
__IV. present participle ἐπιστάμενος, η, ον, frequently as adjective, knowing, understanding, skilful, ἀνδρὸς . [Refs 8th c.BC+]; καὶ μάλ᾽ . [Refs 8th c.BC+]; even of a dancer's feet, θρέξασκον ἐπισταμένοισι πόδεσσι [Refs 8th c.BC+] skilled, versed in them, [Refs 8th c.BC+]
__IV.2. adverb ἐπιστᾰμένως skilfully, expertly,[Refs 8th c.BC+]; εὖ καὶ . [Refs 8th c.BC+]; also in Prose, [Refs 5th c.BC+]: c.infinitive, with knowledge how to.., [Refs 4th c.BC+], attend, observe, it is probably that ἐπίσταμαι is merely an old middle form of ἐφίστημι,[Refs 4th c.BC+]

LSJ Scripture Refs: Acts.19.15