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Definition of YouTube
1. Noun. (neologism) Any website that allows users to upload content, particularly YouTube itself. ¹
2. Noun. (neologism) A small video that can be viewed online, particularly one hosted on YouTube. ¹
3. Proper noun. a video-sharing website. ¹
4. Verb. (neologism transitive) To upload a video of something to YouTube. ¹
¹ Source: wiktionary.com