In music, Mezzo staccato means "moderately detached". It is a style of playing between staccato

Staccato

Staccato is a form of musical articulation. In modern notation it signifies a note of shortened duration and separated from the note that may follow by silence...

 and legato

Legato

In musical notation the Italian word legato indicates that musical notes are played or sung smoothly and connected. That is, in transitioning from note to note, there should be no intervening silence...

, and is also referred to as non-legato. Mezzo staccato notes are held for a longer time than with standard staccato notes, but none of the notes are attached to the next.

Mezzo staccato is sometimes indicated in words, or can be shown by either a tenuto

Tenuto

Tenuto is a direction used in musical notation. Arguably, it is one of the first directions to be used in music notation, as Notker of St...

 above a staccato mark, or a slur

Slur (music)

A slur is a symbol in Western musical notation indicating that the notes it embraces are to be played without separation. This implies legato articulation, and in music for bowed string instruments, it also indicates the notes should be played in one bow; and in music for wind instruments, that the...

that encompasses a phrase of staccato notes.