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)

In an accidental manner; unexpectedly; by chance; casually; fortuitously.

He discovered penicillin largely accidentally .

Unintentionally.

He accidentally exposed the bacteria to mold spores.

* {{quote-news, year=2011

, date=December 14 , author=Steven Morris , title=Devon woman jailed for 168 days for killing kitten in microwave , work=Guardian citation , page= , passage=Robins, of Torquay, had denied a single charge of causing unnecessary suffering to an animal. She claimed the microwave was accidentally turned on by one of the cats after the kitten got inside. But Knutton said the kitten was too small to even get onto the work surface.}}