One of the mysteries of the English language finally explained.
1In a supplementary or subordinate manner; as an adjunct; additionally; secondarily; incidentally.
2Law. = "accessarily".
Late 15th century; earliest use found in Apology for Lollard Doctrines. Apparently partly (in early use) from post-classical Latin accessorius accessory + -ly, and partly (in later use) from accessory + -ly. Compare post-classical Latin accessorie as an accessory or adjunct.
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