particularly; exceptionally; markedly: Be especially watchful.
Can be confused: especially, specially
(see synonym study at the current entry).
signally, notably; mainly. Especially, chiefly, particularly, principally refer to those cases that seem to be significant. Especially and particularly single out the most prominent case or example (often in order to particularize a general statement): Winter is especially severe on old people. Corn grows well in the Middle West, particularly in Iowa. Chiefly and principally imply that the general statement applies to a majority of the cases in question, and have a somewhat comparative force: Owls fly chiefly at night. Crime occurs principally in large cities.