Quick Definition
an encamped army
Strong's Definition
a camping-ground, i.e. (by implication) a body of troops
Derivation: from the base of G4756 (στρατιά) and the same as G3977 (πεδινός);
KJV Usage: army
Thayer's Greek Lexicon
στρατόπεδον, στρατοπεδονου, τό (στρατός, and πέδον a plain), from Herodotus down;
a. a military camp.
b. soldiers in camp, an army: Luk_21:20.
Mounce Concise Greek Dictionary
στρατόπεδον stratopedon 1x
pr. the site of an encampment; an encampment; meton. an army, Luk_21:20
Abbott-Smith Greek Lexicon
στρατό -πεδον , -ου , τό
(στρατός + πέδον , a plain),
[in LXX : Jer_34:1 ( H2428 ), 2Ma_8:12 , al. ;]
(a) a military camp;
(b) an army: Luk_21:20 .†
Moulton & Milligan — Vocabulary of the Greek NT
στρατόπεδον [page 593]
For στρατόπεδον = soldiers in camp, army, as in its only occurrence in the NT ( Luk_21:20 ), cf. Preisigke 4275 .7 (A.D. 216) Ἰουλίαν Δόμναν Σεβαστὴν τὴν μητέρα τῶν ἀν [ικήτων ] στρατοπέδων , and similarly 5075 .3 (time of Caracalla). In BGU III. 993 ii. 7 (B.C. 128 7) ἐν τῶι τοῦ βασιλέως στρατοπέδωι , the word seems to have its ordinary meaning camp.
Liddell-Scott — Intermediate Greek Lexicon
στρατόπεδον στρα^τό-πεδον, ου, τό, "the ground on which soldiers are encamped, a camp, encampment", Hdt. , Aesch. :— hence, "a camp, encamped army", Hdt. , Thuc. generally, "an army", Hdt. ; also, "a squadron" of ships, id=Hdt. , Thuc. the Roman "legion", Polyb.
STEPBible — Tyndale Abridged Greek Lexicon
στρατό-πεδον, -ου, τό
(στρατός + πέδον, a plain), [in LXX: Jer.34:1 (חַיִל), 2Ma.8:12, al. ;]
__(a) a military camp;
__(b) an army: Luk.21:20.†
(AS)