The noun now has 1 sense (first 1 from tagged texts)
1. (10) now -- (the momentary present; "Now is a good time to do it"; "it worked up to right now")
Overview of adv now
The adv now has 7 senses (first 7 from tagged texts)
1. (494) now, at present -- (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")
2. (337) 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")
3. (307) now -- (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")
4. (83) now -- ((prefatory or transitional) indicates a change of subject or activity; "Now the next problem is...")
5. (39) now -- (used to preface a command or reproof or request; "now hear this!"; "now pay attention")
6. (22) immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, in real time, like a shot -- (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!")
7. (1) now -- (in the immediate past; "told me just now")