Source/sɔːrs/ Definition 1 of 4Pro Tip 1/3Physical Origins Refers to the actual beginning or starting point of a physical item or phenomenon. Wine has its source in grapes. Pro Tip 2/3Figurative Source Used metaphorically to refer to the beginning of abstract concepts like ideas or feelings. Curiosity was the source of his scientific discoveries. Pro Tip 3/3Resource Association Often associated with a resource that is provided or obtained from something. The library is a great source of knowledge.