Strong's G4961 · Greek

συστρατιώτης

sustratiotes · soos-trat-ee-o'-tace

from 4862 and 4757; a co-campaigner, i.e. (figuratively) an associate in Christian toil

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 2 * συν-στρατιώτης (Rec. συσ- ), -ου, ὁ a fellow-soldier (Plat., Xen., al.). Metaph., of fellowship in Christian service: Phl 2:25 , Phm 2 .† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain