Which term signifies playing in a light and delicate manner?

The term that signifies playing in a light and delicate manner is "leggero." This Italian word literally means "light" and is often used in music to indicate that a passage should be performed with a light touch, emphasizing delicacy and ethereality in the sound. Performers interpreting "leggero" will typically focus on clarity, a gentle articulation, and a sense of buoyancy in their playing, contributing to the overall texture and emotion of the piece.

In contrast, the other terms pertain to different styles of playing. "Espressivo" refers to a more expressive and emotional performance, demanding depth and intensity rather than lightness. "Legato" indicates smooth and connected playing, where notes are played in a flowing manner without perceptible breaks, which may not necessarily imply lightness. "Marcato" suggests the opposite; it means playing with emphasis or a marked style, often stronger and more assertive than "leggero." Thus, "leggero" is indeed the most appropriate choice to convey a light and delicate manner of performance.