That adds value, either monetary, intellectual, or emotional.

Enrichment.

present participle of enrich

plural of unjust enrichment

plural of undue enrichment

(law) unjust enrichment.

(law) a benefit gained at another's expense without legally justifiable grounds, such as one gained by mistake.

(chemistry, military) Uranium enriched with a higher than normal amount of the fissile isotope U-235; used in nuclear reactors and nuclear weapons.

(nuclear physics) Enriched uranium with at least 2% but less than 20% uranium-235, enough to sustain a nuclear fission chain reaction in a nuclear reactor moderated by light water but not enough to allow a self-sustaining fission chain reaction without a moderator; used as the main nuclear fuel in most commercial nuclear reactors used to generate electricity.

Alternative form of slightly-enriched uranium