monotheism
Concise Oxford English Dictionary © 2008 Oxford University Press:
monotheism /ˈmɒnə(ʊ)ˌθiːɪz(ə)m/
▶noun the doctrine or belief that there is only one God.
– derivatives
monotheist noun & adjective,
monotheistic adjective,
monotheistically adverb.
monotheist noun & adjective,
monotheistic adjective,
monotheistically adverb.
'monotheism' also found in these Oxford entries:

