One of the mysteries of the English language finally explained.
1obsolete, rare In non-physical senses: in an adherent manner; with adherence; (in early use) specifically †by association, concomitantly (obsolete). rare in later use.
2By means of (a) physical attachment; adhesively.
Early 17th century; earliest use found in Robert Parker (?1564–1614), religious controversialist. From adherent + -ly.
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