Purpose/ˈpɜːrpəs/ Definition 1 of 4Pro Tip 1/3Context Matters The word 'purpose' changes meaning depending on the situation and what it's referring to. The purpose of a knife is to cut. Pro Tip 2/3Common Phrases 'Purpose' is often used with phrases like 'on purpose' to indicate intent, not accidentally. She ignored him on purpose. Pro Tip 3/3Figurative Use People often talk about 'life's purpose', which is a philosophical idea of life's meaning. Many search for their life's purpose.