means Having a lot of money or valuable assets — or, more loosely, being abundant in something good, like flavor, color, or detail.

from From Old English 'rice,' meaning powerful or mighty, which back then was as much about ruling as about owning. It's tangled up with the same ancient root that gives us 'Reich' in German and the '-ric' in 'bishopric,' all pointing to dominion and reach. The shift from 'powerful' to 'wealthy' makes a quiet kind of sense — those who held power usually held the gold too. The French 'riche' (also from a Germanic source) likely reinforced the spelling and sense along the way.