Adverbial today has 2 senses
  1. nowadays, now, today - in these times; "it is solely by their language that the upper classes nowadays are distinguished"- Nancy Mitford; "we now rarely see horse-drawn vehicles on city streets"; "today almost every home has television"
  2. today - on this day as distinct from yesterday or tomorrow; "I can't meet with you today"
,Noun today has 2 senses
  1. today - the present time or age; "the world of today"; "today we have computers"
    --1 is a kind of
    present, nowadays
  2. today - the day that includes the present moment (as opposed to yesterday or tomorrow); "Today is beautiful"; "did you see today's newspaper?"
    --2 is a kind of
    day, twenty-four hours, solar day, mean solar day
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