kai (Greek #2532)
and, also, even, so then, too, etc.; often used in connection (or composition) with other particles or small words
KJV usage: and, also, both, but, even, for, if, or, so, that, then, therefore, when, yet.
Pronounce: kahee
Origin: apparently, a primary particle, having a copulative and sometimes also a cumulative force
hapax (Greek #530)
one (or a single) time (numerically or conclusively)
KJV usage: once.
Pronounce: hap'-ax
Origin: probably from 537