accelerate verb Stress: second syllable 🤍 Save Syllables: ac-cel-er-ate (4) English Definition To increase in speed or rate. Example Sentence The car began to accelerate. US IPA /əkˈseləreɪt/ 🔊 Listen US UK IPA /əkˈseləreɪt/ 🔊 Listen UK Synonyms hasten speed up quicken expedite Antonyms decelerate slow down delay Share this Word Facebook WhatsApp X Telegram Copy Link