Definition: The word "today" is an adverb that means "onthis day," referring to the currentdate, distinct from yesterday (the day before) and tomorrow (the day after). It can also be usedas a noun to refer to the presenttimeor the current day.
Adverb
onthis day asdistinct from yesterdayortomorrow
I can't meet with you today
in these times
it is solelyby their language that the upperclassesnowadaysaredistinguished- Nancy Mitford
we nowrarelyseehorse-drawnvehiclesoncitystreets
todayalmosteveryhome has television
Noun
the day that includes the present moment (asopposed to yesterdayortomorrow)