Ottava is an Italian word that is translated into English as "octave." It is commonly used in musical notation and refers to a musical interval representing eight diatonic degrees between two notes. There are several synonyms for the word "ottava' that can be used interchangeably in sheet music. These synonyms include "octave above," "8va," "ouvert" in French, "Oktav" in German, and "ottava sopra" in Italian. All of these synonyms have the same meaning as 'ottava.' The use of synonyms helps in reducing the redundancy of words in musical notation, and provides greater clarity to musicians.