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treadmill - English spelling dictionary treadmill. Use our dictionary to check the spelling definitions of words. You can translate the dictionary words into your native language. This course teaches English spelling rules with interactive exercises and spelling tests, helping learners with problems such as dyslexia to improve their English spelling and helping others to learn English as a foreign language. Treadmill - Wikipedia A treadmill is a device generally used for walking, running, or climbing while staying in the same place. Treadmills were introduced before the development of powered machines to harness the power of animals or humans to do…