Lexical Definition

‎ἀγαπητός‎ agapētós (ag-ap-ay-tos') beloved ^G:A
from ‎ἀγαπάω‎

(dearly, well) beloved, dear.

Abbott-Smith

ἀγαπητός, -ή, -όν (< ἀγαπάω), [in LXX chiefly for יָתִיד, יָדִיד;]
beloved (v. M, Pr., 221);
(a) by God: of Christ, Mt 3:17; of men, Ro 1:7;
(b) by Christians, of one another: I Co 4:14; freq. as form of address, I Co 10:14; opp. to ἐχθρός, Ro 11:28 (v. AR, Eph., 229; Cremer, 17; MM, VGT, s.v.).

Abbott-Smith References

Liddell-Scott-Jones

ἀγαπητός-ητός, ή, όν,

Doric dialect ἀγαπητός-ᾱτός, ά, όν, that wherewith one must be content [ἀγαπητόςάω 111)">Refs], hence of only children, μοῦνος ἐὼν ἀ.[ἀγαπητόςητή LXX.Judg.11.34, cf. LXX.Tob.3.10, NT.Mark.12.6 (but compare also 11.2), etc.">NT+8th c.BC+]; ἀγαπητόςητός· μονογενής, [Refs 4th c.BC+]

__2 to be acquiesced in (as the least in a choice of evils), [Refs 5th c.BC+] —hence, ἀγαπητόςητόν [ἐστι] one must be content, εἰ.., ἐάν.. [Refs 5th c.BC+]; with infinitive, [Refs]
__II of things, desirable, ἤθη[Refs 5th c.BC+]
__II.2 of persons, beloved, ἀδελφὲ ἀγαπητόςητέ[LXX]: in letters, as a term of address, [NT]
__III adverb -τῶς gladly, contentedly, [Refs 5th c.BC+]
__III.2 just enough to content one, barely, scarcely, [Refs 5th c.BC+]

_{LSJ Scripture Refs: LXX.Judg.11.34 ☩ Mark.12.6 ☩ Rom.12.19}