Adverb

(en adverb)

From time to time; now and then; once in a while; irregularly; at infrequent intervals.

*1592 , Gabriel Harvey, "Fovre Letters", Miscellaneous Tracts , page 56

*:Were nothing els di?cour?ively in?erted (as ?ome little el?e occa?ionally pre?ented it ?elfe), what paper more currently fit for the bare?t mechanicall u?es,...

*1619 , John Richardson, John Toland, The canon of the New Testament Vindicated , page 30

*:I think it is plain, that Origen'', whatever Character he may have occa?ionally given of this Book, did not judge it any part of the ''Canon ...

*1639 , Henry Ainsworth, Annotations Upon the Five Books of Moses, the Book of the Psalmes and the Song of Songs , page 177.

*:God ?etteth no houres for the morning or evening ?acrifice because they may occa?ionally be changed.

* 1855 , Horace Mann, "On the Statistical Position of Religious Bodies in England and Wales," Journal of the Statistical Society of London , vol. 18, no. 2, p. 152,

Some perhaps worship only on alternate Sundays; others still more occasionally .

* 1978 , Stephen R. Graubard, "Twenty Years of 'Daedalus'," Bulletin of the American Academy of Arts and Sciences , vol. 32, no. 3, p. 18,

The journal, more occasionally , has turned to what might be called "fashionable" themes.

* 2007 , Matt Gouras/AP, " Wildfires Rage in Montana," Time , 17 Aug,

Flames could still be seen from town flaring up occasionally on a hill dotted with emergency vehicles.

Adverb

(en adverb)

At frequent intervals.

* {{quote-magazine, year=2013, month=July-August, author= Stephen P. Lownie], [http://www.americanscientist.org/authors/detail/david-m-pelz David M. Pelz

, magazine=(American Scientist), title= Stents to Prevent Stroke , passage=As we age, the major arteries of our bodies frequently become thickened with plaque, a fatty material with an oatmeal-like consistency that builds up along the inner lining of blood vessels. The reason plaque forms isn’t entirely known, but it seems to be related to high levels of cholesterol inducing an inflammatory response, which can also attract and trap more cellular debris over time.}}

(mathematics, of a sequence) For infinitely many terms of the sequence.