συστρατιώτης systratiṓtēs

Meaning

a co-campaigner, i.e. (figuratively) an associate in Christian toil

In the King James Version: fellowsoldier

Derivation: from G4862 (σύν) and G4757 (στρατιώτης);

Where it is used

• Philippians 2:25 But I thought it necessary to send back to you Epaphroditus, my brother, fellow worker, and fellow soldier, who is also your messenger and minister to my needs.
• Philemon 1:2 to Apphia our sister, to Archippus our fellow soldier, and to the church that meets at your house: