An embellishing note usually written in smaller size WordNet 3.0 & Open English WordNet

A grace note is a kind of music notation denoting several kinds of musical ornaments. Wikipedia

An appoggiatura is a musical ornament that consists of an added non-chord note in a melody that is resolved to the regular note of the chord. Wikipedia

A kind of music notation Wikipedia Disambiguation

Kind of music notation used to denote several kinds of musical ornaments. Wikipedia Disambiguation

Musical ornament Wikidata

A short grace note (theoretically taking no time at all), occurring on the beat occupied by the main note to which it is prefixed, one scale-step higher or lower than that main note. (Sometimes equivalent, therefore, to a short appoggiatura, but in Baroque music interpreted differently and more strictly.) Written as a note lighter in appearance, typically a quaver (eighth note), with an oblique stroke through the stem. Wiktionary

Short grace note occurring on the beat occupied by the main note. Wiktionary (translation)

A type of musical ornament, falling on the beat, which often creates a suspension and subtracts for itself half the time value of the principal note which follows. Wiktionary

A type of musical ornament which creates a suspension. Wiktionary (translation)

A musical note, indicated on a score in smaller type with or without a slash through it, played to ornament the melody rather than as part of it. Its note value does not count as part of the total time value of the measure it appears in. Wiktionary

Musical note played to ornament the melody. Wiktionary (translation)