Lexical Definition

‎μονογενής‎ monogenḗs (mon-og-en-ace') unique G:A
from ‎μόνος‎ and ‎γίνομαι‎

only (begotten, child).

Usage: 5 forms in 13 verses
Form Translated As     In Verse(s)
μονογενῆ one and only 1John.4.9
only begotten John.3.16Heb.11.17
μονογενὴσ an only Luke.8.42
only begotten Luke.7.12John.1.18
μονογενοῦσ of an only begotten John.1.14
only begotten John.3.18
μονογενήσ an only child LXX.Judg.11.34LXX.Ps.25.16Luke.9.38
μονογενή my only child LXX.Ps.22.20LXX.Ps.35.17

Abbott-Smith

μονογενής, -ές (< μόνος, γένος), [in LXX: Jg 11:34, Ps 21 (22):20 24 (25):16 34 (35):17 (יָחִיד), To 3:15 6:10, 14 8:17, Wi 7:22, Ba 4:16*;]
only, only begotten (DCG, ii, 281), of sons and daughters: Lk 7:12 8:42 9:38, He 11:17; of Christ, Jo 3:16, 18, I Jo 4:9; μ. παρὰ πατρός, Jo 1:14; μ. θεός, Jo 1:18.†

Abbott-Smith References

Book Refs
Judges 11:34
Psalms 22:20 · 25:16 · 35:17
Luke 7:12 · 8:42 · 9:38
John 1:14 · 1:18 · 3:16 · 3:18
Hebrews 11:17
1 John 4:9

Liddell-Scott-Jones

μονογενής-γενής, ές,

Epic dialect and Ionic dialect μουνο-, (γένος) the only member of a kin or kind: hence, generally, only, single, παῖς [NT+8th c.BC+]; of Hecate, [Refs 8th c.BC+]

__2 unique, of τὸ ὄν, [Refs 5th c.BC+]
__3 μ. αἷμα one and the same blood, uncertain reading in [Refs 5th c.BC+]
__4 Grammars, having one form for all genders, [Refs 2nd c.AD+]
__5 name of the foot ¯ ¯ ¯ ?\~X, [Refs 7th c.AD+]
__II adverb -νῶς, φέρεται μ. ἐν ἑνὶ τόπῳ grows only in one place, [Refs]
__II.2 in a unique manner, [Refs 6th c.AD+]

LSJ Scripture Refs: John.1.14