Now has 15 different meanings across 5 categories:
Noun · Adverb · Conj · Intj · Proper Noun
The present time.
Misspelling of know.
Present; current.
in the historical present; at this point in the narration of a series of past events
"President Kennedy now calls in the National Guard"
"Washington now decides to cross the Delaware"
"the ship is now listing to port"
at the present moment
"goods now on sale"
"the now-aging dictator"
"they are now abroad"
"he is busy at present writing a new novel"
"it could happen any time now"
without delay or hesitation; with no time intervening
"he answered immediately"
"found an answer straightaway"
"an official accused of dishonesty should be suspended forthwith"
"Come here now!"
(prefatory or transitional) indicates a change of subject or activity
"Now the next problem is..."
At the present time.
Since, because, in light of the fact; often with that.
Indicates a signal to begin.
Acronym of National Organization for Women.
The word "now" comes from Middle English and Old English, tracing its roots back to the Proto-Indo-European language. Its original meaning was simply "now.