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1.
The present day. Started at the end of yesterday, the second it went past midnight, it became today. Today ends once it goes past midnight.

Also a song. The video for this song features Billy Corgan as an icecream man picking up a corss-dressing guitar player, and performing DIY.
"I have to get this done today"

"I shall paint my icecream van today"

"Today is
Today is
Today is
The greatest day
That I have ever known"
by Kung-Fu Jesus April 21, 2004
 
2.
the greatest day i've ever known
today is the greatest day i've ever known
by futuramafan March 06, 2008
 
3.
The day after yesterday and the day before tomorrow.
In other words,THE DAY YOU ARE CURRENTLY READING THIS MESSAGE!
"Today is the day for a living..."
"I have a test today."
by Tsuzuja March 20, 2004
 
4.
The current pre-determined expanse of time consisting of 24 hours that is unfolding at the exact moment that your consciousness is expierencing for the first time.
Today is a great day.
by A-person_yay March 27, 2014
 
5.
Today is a day that is allyaws there... today is today, as it was a year or decade ago! Yestersay was also today, and even tomorow will be named... TODAY!
I went out yesterday (when it was today) and came home earlly in the morning -today ofcourse!
by AIR-Zig January 25, 2008
 
6.
today is yesterday and tomorrow is today
you heard me, i said it
by the December 10, 2004