The Collaborative International Dictionary of English v.0.48:

Aye \Aye\, Ay \Ay\, adv. [Icel. ei, ey; akin to AS. [=a],
   [=a]wa, always, Goth. aiws an age, Icel. [ae]fi, OHG, ?wa, L.
   aevum, Gr. ? an age, ?, ?, ever, always, G. je, Skr. ?va
   course. ?, ?. Cf. Age, v., Either, a., Or, conj.]
   Always; ever; continually; for an indefinite time.
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         For his mercies aye endure.              --Milton.
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   For aye, always; forever; eternally.
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The Collaborative International Dictionary of English v.0.48:

Ay \Ay\, interj.
   Ah! alas! "Ay me! I fondly dream `Had ye been there.'"
   --Milton.
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The Collaborative International Dictionary of English v.0.48:

Ay \Ay\, adv.
   Same as Aye.
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The Collaborative International Dictionary of English v.0.48:

Aye \Aye\, Ay \Ay\, adv. [Perh. a modification of yea, or from
   the interjection of admiration or astonishment, OE. ei, ey,
   why, hey, ay, well, ah, ha. Cf. MHG. & G. ei, Dan. ej. Or
   perh. akin to aye ever.]
   Yes; yea; -- a word expressing assent, or an affirmative
   answer to a question. It is much used in viva voce voting in
   legislative bodies, etc.
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   Note: This word is written I in the early editions of
         Shakespeare and other old writers.
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