Greek word
sḗmeron
σήμερον
What it means
on the day
on the (i.e. this) day (or night current or just passed); generally, now (i.e. at present, hitherto)
Where it comes from
neuter (as adverb) of a presumed compound of the article ho (ὁ) (t changed to s) and hēméra (ἡμέρα)