D defs.my
Entry 1 sense Webster, 1913

Occasionally

/ək-āzh'-ən-əl-ē/ · Oc·ca·sion·al·ly · IPA /əˈkeɪʒənəli/
01 adv. In an occasional manner; on occasion; at times, as convenience requires or opportunity offers; not regularly.
  1. 1.
    In an occasional manner; on occasion; at times, as convenience requires or opportunity offers; not regularly.
    “The one, Wolsey, directly his subject by birth; the other, his subject occasionally by his preferment.” Fuller.