Etymology
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especially (adv.)

c. 1400, from especial + -ly (2).

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Definitions of especially

especially (adv.)
in a special manner;
Synonyms: specially
especially (adv.)
to a distinctly greater extent or degree than is common;
an especially (or specially) cautious approach to the danger
Synonyms: particularly / peculiarly / specially
From wordnet.princeton.edu