Which term describes a tempo that is slightly faster than andante?

The term that describes a tempo slightly faster than andante is andantino. Andante generally indicates a moderate pace, often interpreted as walking speed. Andantino is derived from "andante" and is typically understood to imply a tempo that is somewhat quicker, although interpretations can vary. This makes it an appropriate choice when looking for a term that reflects a slight increase in tempo over andante.

The other choices represent different tempos: allegro denotes a lively and fast pace, allegretto is moderately fast but generally faster than andante yet slower than allegro, while vivace indicates a brisk and lively tempo. Therefore, andantino is the most accurate answer when specifically identifying a tempo that is faster than andante, but not as fast as the others.