Lexical Definition

‎εἰσακούω‎ eisakoúō (ice-ak-oo'-o) to listen to ^G:V
from ‎εἰς‎ and ‎ἀκούω‎

hear.

• to listen to

Abbott-Smith

εἰσ-ακούω [in LXX chiefly for שָׁמַע, also for עָנָה, etc. ;]
to listen to, in two senses;
(a) to obey: I Co 14:21 (cf. De 1:43, Si 3:6)
(b) to listen, assent to; pass., to be heard: of persons praying, Mt 6:7, He 5:7; of the prayer offered, Lk 1:13, Ac 10:31 (cf. Ps 4:2*, Si 34:26); v. Cremer, 624).†

Abbott-Smith References

Liddell-Scott-Jones

εἰσακούω,

hearken or give ear to one, ὡς ἔφατ᾽· οὐδ᾽ ἐσάκουσε.. Ὀδυσσεύς [Refs 8th c.BC+]; give way, yield to a request, [Refs 5th c.BC+]; of God, τινός or τῆς προσευχῆς [LXX]:—so in passive, of the prayer, [NT]; of the person, [NT]

__2 in Poets, simply, hear, τούτου λέγοντος εἰσήκουσ᾽ ἐγώ, ὡς.. [Refs 5th c.BC+]; τίνος βροτῶν λόγον τόνδ᾽ εἰ.; [Refs 5th c.BC+]
__3 perceive, feel effect of, τοῦ ἐγκεφάλου ἐσακούσαντος τοῦ τρώματος [Refs 5th c.BC+]
__II passive in strict sense, ἔξωθεν εἰς τὰς οἰκίας εἰσακούεται μᾶλλον ἢ ἔσωθεν ἔξω [Refs 4th c.BC+]

_{LSJ Scripture Refs: LXX.Ps.4.2* ☩ Luke.1.13 ☩ Matt.6.7}