Where does “accidentally” come from?

Accidentally derives from English accidental plus the Middle English adverbial suffix -ly, from Old English -līċ meaning "like" or "having the form of," from Proto-Germanic -līkaz, ultimately from Proto-Indo-European roots meaning "to appear" and "together."

accidentally (English): In an accidental manner; by chance, unexpectedly;...

Definitions

  1. In an accidental manner; by chance, unexpectedly;...

Ancestry of “accidentally”, step by step

StepLanguageWordMeaning
1EnglishaccidentalNot essential; incidental, secondary;...
2Middle Englishaccidental
3Middle Frenchaccidentel
4Late Latinaccidentalis
5Latinaccidēnsfalling down, upon, at or near, descending
6Latinaccidōto fall down, upon, at or near; descend
7Latinad-to; usually prefixed to verbs, in which cases it...
8Latinīn-un-, non-, not
9Latinînin, at, on, upon, from (space)
10Latinenlookǃ beholdǃ; reallyǃ?; come onǃ
11Proto-Italicenin
12Proto-Indo-Europeanh₁énin
Every word from Proto-Indo-European h₁énEvery word from Latin īn-Every word from Latin ad-