avocation
Concise Oxford English Dictionary © 2008 Oxford University Press:
avocation /ˌavəˈkeɪʃ(ə)n/
▶noun a hobby or minor occupation.
– derivatives
avocational adjective.
avocational adjective.
– origin C17: from L. avocatio(n-), from avocare ‘call away’.
'avocation' also found in these Oxford entries:

