megalomania
US /ˌmeɡ.əl.əˈmeɪ.ni.ə/
UK /ˌmeɡ.əl.əˈmeɪ.ni.ə/

1.
мегаломания, мания величия
a mental illness or condition in which a person has a strong desire for power and believes that they are very important and powerful
:
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His megalomania led him to believe he was destined to rule the world.
Его мегаломания привела его к убеждению, что ему суждено править миром.
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The dictator's megalomania grew with each victory.
Мегаломания диктатора росла с каждой победой.