Lexical Definition

‎ἐπιστέλλω‎ epistéllō (ep-ee-stel'-lo) to write to ^G:V
from ‎ἐπί‎ and ‎στέλλω‎

write (a letter, unto).

• to enjoin (by writing), i.e. (genitive case) to communicate by letter (for any purpose)

Abbott-Smith

ἐπι-στέλλω [in LXX: III Ki 5:8(22) Ne 6:19 (שָׁלַח), Jth 15:4, I Mac 10:25 12:7 13:18 (in each case with v.l. ἀποσ-) * ;]
1. to send to.
2. to send a message by letter, to write word (MM, Exp., xiv): c. dat. pers., Ac 21:25, He 13:22; seq. τοῦ, c. inf., Ac 15:20.†

Abbott-Smith References

Liddell-Scott-Jones

ἐπιστέλλω,

send to, γράψας ἐς βυβλίον τάδε ἐπέστειλε ἐς Σάμον [Refs 5th c.BC+]; send a message, τάδε [Refs 5th c.BC+]; especially by letter, write word, τοιαῦτα [Refs 5th c.BC+]; περί τινος ὡς ἀδικοῦντος [Refs 5th c.BC+]; τὰ ἐπισταλέντα ἐκ τῆς Σάμου the news received from Samos,[Refs 1st c.AD+]

__2. enjoin, command, τισί τι [Refs 5th c.BC+]; τὸν ἄγγελον ἐπιστείλας ταῦτα ἔπεμψε [Refs 5th c.BC+]: c.infinitive, ἐ. τινὶ ἀπίστασθαι [Refs 5th c.BC+]; ὁ Κῦρος αὐτῷ ἐπέστελλε πρὸς Πέρσας λέγειν [Refs 5th c.BC+]; also ἐ. τινὰ ποιεῖν τι [Refs 5th c.BC+]: without any case, give orders to do, [Refs 5th c.BC+]; give orders in writing, [Refs 4th c.BC+] — passive, ἔφη οὐδέν οἱ ἐπεστάλθαι ἄλλο ἢ ἀπαλλάσσεσθαι he had received orders to.., [Refs 5th c.BC+]; αἷς ἐπέσταλται τέλος to whom the office has been committed, [Refs 5th c.BC+]; ἀξιῶ ἐπισταλῆναί τισι c.infinitive, [Refs 2nd c.AD+] having received these instructions, [Refs 5th c.BC+]: in later writers, usually of orders given in writing, [NT+2nd c.AD+], etc.; of orders for payment, [Refs 2nd c.AD+]

_{LSJ Scripture Refs: Acts.15.20}