Quick Definition
συστρατιώτης, ου, ὁ n.m. a fellow soldier
Strong's Definition
from 4862 and 4757; a co-campaigner, i.e. (figuratively) an associate in Christian toil
KJV Usage: fellowsoldier
UBS Dictionary of the Greek New Testament
noun, m. | -ου | στρατεύομαι
34.19 · Association · Associate
one who struggles along with, one who works arduously along with, fellow struggler (a figurative extension of meaning of συστρατιώτης ‘fellow soldier,’ not occurring in the NT) one who serves in arduous tasks or undergoes severe experiences together with someone else A strictly literal translation of συστρατιώτης in PHM 1:2 might imply that Paul himself was a soldier and therefore, in a sense, a secret agent of some military force. Accordingly, it may be necessary to employ a simile, for example, ‘who works like a fellow soldier’ or ‘one who experiences great hardships along with us.’
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
συ-στρατιώτης [Τ᾿ Tr WH συν- (so Lehm. in Philem.; cf. σύν, 11. fin.) ], -ov, ὁ, a fellow-soldier, Xen., Plat., al.; trop. an associate in labors and conjlicts for the cause of Christ: Phil. ii. 25; Philem. 2.
Mounce Concise Greek Dictionary
συστρατιώτης systratiōtēs 2x
a fellow soldier, co-militant, in the service of Christ, Phil. 2:25; Phlm. 2*
Abbott-Smith Greek Lexicon
* συν-στρατιώτης (Rec. συσ-), -ου, ὁ a fellow-soldier (Plat., Xen., al.). Metaph., of fellowship in Christian service: Phl 2:25, Phm 2 .†
Moulton & Milligan — Vocabulary of the Greek NT
συνστρατιώτης. This expressive Pauline comp4, (Phil 255, Philem®) is found in a soldier’s letter to his mother, where he mentions that he has borrowed money from a fellow-soldier, BGU III. 81427 (iii/A.D.) κέχρημαι χαλκὸν π[α]ρὰ συστρατιώτου : cf. Ostr 15354 (ii/B.C.) Tots συνστρατιώταις αὐτοῦ, P Meyer 207 (1st half iii/A.p.) ἔπεμσα διὰ Διοσκόρ[ο]ν συνστραπιώτου Διοπολείτου, and the Christian P Grenf I. 53° (iv/A.D.) ἔπεμψά σοι διὰ “Arwvos τοῦ συνσρατιώτου σοι γράμματα καὶ μάφορτιν (‘‘ahead-dress”’). In Menandrea p- 120% συ]στρατ[ιώτας is a probable supplement. For the verb see P Frankf 7:2 (after B.c. 218-7).
Liddell-Scott-Jones — Greek-English Lexicon
συστρατιώτης (sustratiōtēs) — fellow soldier. συστρᾰτιώτης, ου, ὁ, fellow-soldier, [NT+5th c.BC+]:—feminine συστρᾰτηγ-ῶτις, ιδος, metaphorically, [Refs 1st c.AD+]