Definitions

1. noun

A bird, especially a sparrow or a finch, that passes through a place or a region in its annual migration.

“The passant birds migrated through the park in large flocks.”

2. noun

In chess, a bishop that is not on a square of the color of the square on which it will stand after it moves.

“The opponent’s passant bishop was vulnerable to attack.”

3. adjective

Passing or going through a place or region.

“The passant stream flowed gently through the valley.”