richness

Concise Oxford English Dictionary © 2008 Oxford University Press:
rich/rɪtʃ/

▶adjective

• 1 having a great deal of money or assets.

  ■ (of a country or region) having valuable natural resources or a successful economy.

  ■ of expensive materials or workmanship.

• 2 plentiful; abundant.

  ■ (rich in) having (something) in large amounts.

  ■ (of food) containing much fat, spice, etc.

  ■ (of the mixture in an internal-combustion engine) containing a high proportion of fuel.

• 3 (of a colour, sound, or smell) pleasantly deep and strong.

• 4 full of interesting diversity: what a full, rich life you lead!

• 5 producing or yielding a large quantity of something.

  ■ (of soil or land) fertile.

• 6 informal (of a remark) causing ironic amusement or indignation.

– derivatives
richen verb,
richness noun.

– origin OE rīce ‘powerful, wealthy’, of Gmc origin; ult. from Celtic; reinforced in ME by OFr. riche ‘rich, powerful’.