Quick Definition
ἔσω Adv within, inside
Strong's Definition
from 1519; inside (as preposition or adjective)
KJV Usage: (with-)in(-ner, -to, -ward)
UBS Dictionary of the Greek New Testament
prep. (with gen.), advb. | εἰς
83.13 · Spacial Positions · Among, Between, In, Inside
inside, within, in a position defined as being within certain limits
11.11 · Groups and Classes of Persons and Members of Such Groups and Classes · General
insider (a figurative extension of meaning of ἔσω ‘inside,’ 83.13) a person belonging to a so-called in-group (in other words, not being a member of the out-group in question) See also 11.10.
In the rendering of 1CO 5:12 it may be necessary to be quite specific about those who constitute outsiders and insiders, for example, ‘why should I judge those who are not believers? should you not judge the believers?’ Note the rendering of TEV for 1CO 5:12: “After all, it is none of my business to judge outsiders. God will judge them. But should you not judge the members of your own fellowship? As the scripture says, ‘Remove the evil man from your group.’ ”
26.1 · Psychological Faculties
Collocation: ὁ ἔσω (ἄνθρωπος)
the inner being, the inmost being, inwardly (an idiom, literally: the inner (person)) the psychological faculty, including intellectual, emotional, and spiritual aspects, in contrast with the purely physical aspects of human existence In a number of languages it is quite impossible to speak of the psychological faculty of a person as being merely ‘that which is within.’ It is frequently necessary to refer to a particular organ of the body, for example, ‘the heart’ or ‘the liver’ or ‘the spleen.’ In some languages, however, one may refer to this faculty as being ‘the person who stands inside’ or ‘the real person’ or even ‘the other person.’
In LUK 17:21 the phrase ἐντὸς ὑμῶν in the statement ἰδοὺ γὰρ ἡ βασιλεία τοῦ θεοῦ ἐντὸς ὑμῶν ἐστιν ‘look, God’s reign is within you’ may constitute a reference to the same inner being designated by the phrases ὁ ἔσω and ὁ ἐν τῷ κρυπτῷ. On this basis some scholars have suggested that the phrase ἐντὸς ὑμῶν can be interpreted as a potentiality for participation and hence be translated ‘within your grasp,’ but it is more likely that one should understand the phrase ἐντὸς ὑμῶν in LUK 17:21 as a spacial relationship, for example, ‘in your midst’ or ‘among you’ (see 83.9).
1 In contexts where an accompanying expression designates movement into an area, ἐν[a] and εἰς[d] may be rendered as ‘into.’
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ἔσω, adv., (fr. és, for εἴσω [fr. Hom. on] fr. eis; ef. W. 52; [B. 72 (63); Rutherford, New Phryn. p.432]); 1. to within, into: Mt. xxvi. 58; Mk. xiv. 54; with gen. Mk. xv. 16 [W. § 54, 6]. 2. within: Jn. xx. 26; Acts ν. 233 ὁ ἔσω ἄνθρωπος, the internal, inner man, i. 6. the soul, conscience, (see ἄνθρωπος, 1 e.), 2 Co. iv. 16 LT Tr WH; Ro. vii. 22; Eph. iii. 16; οἱ ἔσω, those who belong to the Christian brotherhood (opp. to οἱ ἔξω [q. v. in ὄξω, 1 a.]), 1 Co. v. 12.
Mounce Concise Greek Dictionary
ἔσω esō 9x
can function as an improper prep., in, within, in the interior of, Mt. 26:58; Jn. 20:26; ὁ, ἡ, τὸ ἔσω, inner, interior, internal; met. within the pale of community, 1 Cor. 5:12; ὁ ἐσω ἄνθρωπος, the inner man, the mind, soul, Rom. 7:22
Abbott-Smith Greek Lexicon
ἔσω, Ion. and old Att.. form of εἴσω
(< εἰς),
adv.,
[in LXX for פְנִימָה etc. ;]
prop., after verbs of motion (to) within, into: Mt 26:58, Mk 14:54; c. gen., Mk 15:16.
As freq. in cl. (= cl. ἔνδον), after verbs of rest, within: Jo 20:26, Ac 5:23; οἱ ἔ. (opp. to οἱ ἔξω), I Co 5:12; ὁ ἔ. ἄνθρωπος, Ro 7:22, II Co 4:16, Eph 3:16.†
Moulton & Milligan — Vocabulary of the Greek NT
ἔσω. P Par 4117 (B.C. 160) ἐμοῦ δὲ καθημένου ἔσω ἐν τῷ παστοφορίῳ, BGU IV. ττ27" (B.c. 18) ἐν τῷ ἔσῳ κύκλωι, Sy// 5742 (ii/B.c.) τὸ τέμενος τῆς [᾿Αρτέμιδος ἄσυλον] πᾶν, ὅσον ἔσω m[eptBddov, and the early Christian letter P Grenf II. 73° (late ili/A.D.) (= Selections, p. 118) where the gravediggers bring the banished Politike—eis τὸ ἐγώ, evidently a mistake for εἰς Td ἔσω, ““ into the interior.” The form εἴσω is found in the grave-inscription, Avchzv i. p. 220 No. 28 (B.C. 145-116)— εὔνοια γάρ μιν βαῖνε καὶ εἴσω γᾶς ἄχρι καὶ ὠκεανόν. See also P Giss γὼ. 1375 (= Archiv v. p. 137) εἴσω ἡμερῶν εἴκοσι.
Liddell-Scott-Jones — Greek-English Lexicon
ἔσω (esō) — in/inner/inwardly. εἴσω, ἔσω, used by Epic dialect, Lyric poetry, and Trag. Poets accusative as a spondee or iambus is required; ἔσω (as ἐς for εἰς) prevailed in Ionic dialect and old Attic dialect Prose; but in other Prose and in Comedy texts εἴσω was the only form admitted, whereas ἔσωθεν with the comparative and superlative ἐσώτερος, ἐσώτατος, ἐσωτέρω, ἐσωτάτω, seem to have been the only forms in use:— adverb of εἰς, ἐς, to within, into: absolutely, μή πού τις ἐπαγγείιῃσι καὶ εἴσω lest some one may carry the news into the house, [Refs 8th c.BC+]; also εἴσω δ᾽ ἀσπίδ᾽ ἔαξε he brake it through to the inside, [Refs 8th c.BC+]; πέπληγμαι..ἔσω[Refs 5th c.BC+]; ἡγεῖσθαι εἴσω, φεύγειν εἴσω, [Refs 5th c.BC+] __b when a case follows, [Refs 8th c.BC+] prefers the accusative, δῦναι δόμον Ἄϊδος εἴσω [Refs 8th c.BC+]; more rarely with genitive, κατελθόντ᾽ Ἄϊδος εἴσω [Refs 8th c.BC+]; so in Prose and Trag., Κύκλωπος ἔσω βλεφάρων ὤσας [Refs 5th c.BC+]; it generally follows its case, but precedes in [Refs 8th c.BC+]
2. with Verbs of Rest, ={ἔνδον}, inside, within, εἴσω δόρπον ἐκόσμει [Refs 5th c.BC+]; τὸ ἔσω μέτωπον the inner front, [Refs 5th c.BC+]
2. b with genitive, μένειν εἴσω δόμων [Refs 4th c.BC+]; γλῶσσαν εἴσω πυλῶν ῥέουσαν[Refs 5th c.BC+]; εἴσω ξίφους within reach of sword, [Refs 5th c.BC+]; εἴσω τῶν ὅπλων within the heavy-armed troops, i.e. encircled by them, [Refs 5th c.BC+]; εἴσω τῶν ὀρέων within, i.e. on this side of, the mountains, [Refs]; ἔσω τούτων inside of these people, i.e. farther inland, [Refs 5th c.BC+]; εἴσω βέλους within bow-shot, [Refs 2nd c.AD+]; τὰ δένδρα τῆς ὁδοῦ ποιεῖν εἴσω, i.e. inside, i.e. by the side of, the road, [Refs 4th c.BC+]
II. later of Time, within, εἴσω ἡμερῶν εἴκοσι [Refs 5th c.BC+]
III. for comparative and superlative, see at {ἔσω}.