Sentence:  Devotion to <WSD>Amitābha</WSD> Buddha is found within most schools of the Mahāyāna, but is the essence of Pure Land practice, which centres on the ‘Buddha invocation' (Ch. "nien-fo", Jap. "nembutsu"). This is the repetition of ‘"Nan-mo A-mi-t'o Fo''' (Ch.) or ‘"Nama Amida Butsu''' (Jap.), translations of the Sanskrit ‘"Namo Amitābhāya Buddhāya''', meaning ‘Hail to <WSD>Amitābha</WSD> Buddha'. 
Meaning of the word marked with <WSD> tags:  In (Pure Land Buddhism), a branch of Mahāyāna Buddhism, the name of the principal buddha regarded as of celestial origin.