Outnumber/ˌaʊtˈnʌmbər/ Definition 1 of 1Pro Tip 1/3Contextual Nuance Outnumber typically implies a significant difference in quantity, not just one or two more. In the jungle, insects outnumber mammals substantially. Pro Tip 2/3Non-literal Use 'Outnumber' can be used figuratively to emphasize the overwhelming nature of something. His reasons to stay outnumbered his reasons to leave. Pro Tip 3/3Comparative Contexts Use 'outnumber' when comparing two groups or quantities directly against each other. In the competition, Android users outnumber iPhone users.