FROM STRONG’S GREEK DICTIONARY (1890)

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

semeron σήμερον — say'-mer-on — neuter (as adverb) of a presumed compound of the article 3588 (t changed to s) and 2250; on the (i.e. this) day (or night current or just passed); generally, now (i.e. at present, hitherto):--this (to-)day.

see GREEK for 3588

see GREEK for 2250