Webster's Revised Unabridged Dictionary · 1913

nay

nay (nā) , adverb

[Icelandic nei; akin to English no. See No, adv.]

1.
No; -- a negative answer to a question asked, or a request made, now superseded by no. Opposed to aye or yea. See also Yes.
And eke when I say “ye,” ne say not “nay.” — Chaucer
I tell you nay; but except ye repent, ye shall all likewise perish. — Luke xiii. 3
And now do they thrust us out privily? nay, verily; but let them come themselves and fetch us out. — Acts xvi. 37
He that will not when he may, When he would he shall have nay. — Old Prov

Before the time of Henry VIII. nay was used to answer simple questions, and no was used when the form of the question involved a negative expression; nay was the simple form, no the emphatic.

2.
Not this merely, but also; not only so, but; -- used to mark the addition or substitution of a more explicit or more emphatic phrase.

Nay in this sense may be interchanged with yea. “Were he my brother, nay, my kingdom's heir.”

Nay ({not transcribed}) , noun

1.
Denial; refusal.
2.
A negative vote; one who votes in the negative.
Collocations (1)
It is no nay , there is no denying it. [Obsolete] — haucer

Nay , verb, transitive and intransitive

To refuse. [Obsolete] — Holinshed