FROM STRONG’S GREEK DICTIONARY (1890)

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

kai καί — kahee — apparently, a primary particle, having a copulative and sometimes also a cumulative force; and, also, even, so then, too, etc.; often used in connection (or composition) with other particles or small words:--and, also, both, but, even, for, if, or, so, that, then, therefore, when, yet.