at times; from time to time; now and then.

1615–25; occasional + -ly

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occasionally (əˈkeɪʒənəlɪ)
from time to time

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1620s, from occasional. Originally "happening on some particular occasion" as well as "happening as occasion presents itself, without regularity."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But occasionally amphibian development takes an odd turn.
After all, there has to be a population of animals which would be leaving
  tracks, scat and occasionally bodies.
Occasionally, one would lift off the bottom, grab an insect off the surface and
  drop back to its chosen holding spot.
Though they occasionally spar with crocodiles, a growing number of skirmishes
  are with humans.
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