arbitrary definition: based on random choice or personal whim. Check meanings, examples, usage tips, pronunciation, domains, and related words. Discover expressions like " arbitrary size", " arbitrary unit". Explore the complete meaning of " arbitrary " with expert definitions, real-world usage examples, synonyms, antonyms, and visual aids. Perfect for students, writers, and language learners. 7 Examples Of Arbitrary Used In a Sentence For Kids Arbitrary means something that is chosen or done without any specific reason. We can play any game we want – it’s arbitrary ! Today, let’s pick an arbitrary color to paint with. Let’s take turns choosing arbitrary activities to do together. You can wear any arbitrary costume for the dress-up day at school. Let’s use arbitrary materials to build our own creative project. The order of the story characters is arbitrary . Learn the meaning of arbitrary , an adjective that describes something based on chance or personal power rather than reason or rules. Find out how to use it in sentences and explore related words and phrases.