The term 'SEMIQUAVER, FOR ONE' is a four letter answer to a crossword puzzle and refers to a musical NOTE. A semiquaver is a type of NOTE that is half the duration of a quaver, which is a type of NOTE in musical notation. It is also known as an eighth NOTE and is represented by a filled-in oval with a stem. The semiquaver is used in many different types of music and is often used to create a sense of rhythm and movement.