Definitions:

1. (technology) a process by which energy or a substance enters a system noun
   • a heat source
2. a document (or organization) from which information is obtained noun
   • the reporter had two sources for the story
3. get a product from another country or business verb
   • I sourced a supply of carpet.
4. specify the origin of verb
   • The writers carefully sourced their report.

Synonyms:

• beginning
• generator
• germ
• informant
• reference
• reservoir