What is Petit?

Legal Definition
Sometimes corrupted into petty. A French word signifying little, small. It is frequently used, as petit larceny, petit jury, petit treason.
-- Bouviers Law Dictionary
Legal Definition
Fr. Small; minor; inconsiderable. Used in several compounds, and sometimes written "petty." See Petit cape.
-- Black's Law Dictionary
Legal Definition
Small; petty.
-- Ballentine's Law Dictionary