FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

gar γάρ — gar — a primary particle; properly, assigning a reason (used in argument, explanation or intensification; often with other particles):--and, as, because (that), but, even, for, indeed, no doubt, seeing, then, therefore, verily, what, why, yet.