on occasion

1. From time to time, now and then, as in Nell has been known to eat meat on occasion. This usage, first in the form of upon occasion, replaced by occasion about 1600.

Related Words

• every now and then 
• every so often 
• infrequently www.thesaurus.com
• intermittently 
• now and again 
• occasionally 
• periodically 
• sporadically