occasionally

Adverb

Synonyms: on occasion once in a while now and then now and again at times from time to time

WordNet 3.0

Adverb (1)

now and then or here and there“he was arrogant and occasionally callous”“open areas are only occasionally interrupted by clumps of trees”“they visit New York on occasion”“now and again she would take her favorite book from the shelf and read to us”“as we drove along, the beautiful scenery now and then attracted his attention”Synonyms: on occasion once in a while now and then now and again at times from time to time

Webster's Dictionary (GCIDE)

Occasionally \Oc*ca"sion*al*ly\, adv. In an occasional manner; on occasion; at times, as convenience requires or opportunity offers; not regularly. --Stewart. [1913 Webster]

The one, Wolsey, directly his subject by birth; the other, his subject occasionally by his preferment. --Fuller. [1913 Webster]