In a rich manner, abundantly or luxuriously; with great wealth, abundance, or intensity.
From Old English rice meaning 'powerful, wealthy' plus -ly suffix. Related to Old High German rihhi and ultimately from Celtic rix meaning 'king,' showing the connection between wealth and power in ancient societies.
The word 'rich' originally meant politically powerful rather than financially wealthy - a king was 'rich' because of authority, not gold. This explains why we still say someone 'richly deserves' something, meaning they powerfully or thoroughly deserve it.
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