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1. Happening by chance, unexpectedly or unintentionally
   "accidental poisoning"; "an accidental shooting";
   - inadvertent
    
2. Not of prime or central importance
   "the character's motives remain accidental to the plot";
   - incidental, nonessential
    
3. Being minor or subordinate; happening as a chance consequence
   "accidental expenses";
   - incidental, incident

1. A musical notation that makes a note sharp, flat or natural although that is not part of the key signature

Derived forms: accidentals

See also: inessential, omissible, parenthetic, parenthetical, peripheral, secondary, unessential, unintended

Type of: musical notation

Encyclopedia: Accidental