mb noun Stress: second syllable 🤍 Save Syllables: M-B (2) English Definition Megabyte, a unit of digital information equal to one million bytes. Example Sentence The file size was only 50 MB. US IPA /ˌem ˈbiː/ 🔊 Listen US UK IPA /ˌem ˈbiː/ 🔊 Listen UK Synonyms megabyte data unit Antonyms gigabyte kilobyte Share this Word Facebook WhatsApp X Telegram Copy Link