Webster's Revised Unabridged Dictionary · 1913

Now

Now (nou) , adverb

[Old English nou, nu, Anglo-Saxon , nu; akin to Dutch, Old Saxon, & Old High German nu, German nu, nun, Icelandic, , Danish, Swedish, & Gothic nu, Latin nunc, Greek ny`, ny^n, Sanskrit nu, . r193. Compare New.]

1.
At the present time; at this moment; at the time of speaking; instantly; as, I will write now.
I have a patient now living, at an advanced age, who discharged blood from his lungs thirty years ago. — Arbuthnot
2.
Very lately; not long ago.
They that but now, for honor and for plate, Made the sea blush with blood, resign their hate. — Waller
3.
At a time contemporaneous with something spoken of or contemplated; at a particular time referred to.
The ship was now in the midst of the sea. — Matt. xiv. 24
4.
In present circumstances; things being as they are; -- hence, used as a connective particle, to introduce an inference or an explanation.
How shall any man distinguish now betwixt a parasite and a man of honor? — L'Estrange
Why should he live, now nature bankrupt is? — Shakespeare
Then cried they all again, saying, Not this man, but Barabbas. Now, Barabbas was a robber. — John xviii. 40
The other great and undoing mischief which befalls men is, by their being misrepresented. Now, by calling evil good, a man is misrepresented to others in the way of slander. — South
Collocations (5)
Now and again , now and then; occasionally.
Now and now , again and again; repeatedly. [Obsolete] — Chaucer
Now and then , at one time and another; indefinitely; occasionally; not often; at intervals. A mead here, there a heath, and now and then a wood. — Drayton
Now now , at this very instant; precisely now. [Obsolete] Why, even now now, at holding up of this finger, and before the turning down of this. — J. Webster (1607)
Now... now , alternately; at one time... at another time. Now high, now low, now master up, now miss. — Pope

Now , adjective

Existing at the present time; present. [Rare]
Our now happiness. — Glanvill

Now , noun

The present time or moment; the present.
Nothing is there to come, and nothing past; But an eternal now does ever last. — Cowley