[1] : The Collaborative International Dictionary of English v.0.48

aye \aye\, ay \ay\, adv. icel. ei, ey; akin to as. =a,
   =awa, always, goth. aiws an age, icel. aefi, 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.
   1913 webster

         for his mercies aye endure.              --milton.
   1913 webster

   for aye, always; forever; eternally.
      1913 webster
see also:
age either or for aye always 

Aye >> A Words
Aye, definition of term: Aye
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