From English-Hindi FreeDict Dictionary ver. 1.6: alternation /ˌɒltənˈeɪʃən/ <N> 1. प्रत्यावर्तन "Other planets might also have alternation of day and night."
alternation /ˌɒltənˈeɪʃən/ <N> 1. प्रत्यावर्तन "Other planets might also have alternation of day and night."