Englishfor English speakers
mastery
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noun
(= command)
great skillfulness and knowledge of some subject or activity
a good command of French
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noun
power to dominate or defeat
mastery of the seas
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noun
the act of mastering or subordinating someone
of
Preposition
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Made using.
It is a house of cards.
self
Noun
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Your self is the type of person you are, particularly the way you usually act, look or feel.
He looked so happy compared to his usual down self that Walter wondered if something was wrong.
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Someone's self is their personality or character that makes them individual.
As the baby grows older, it begins to develop a sense of self.
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Self is used to refer to a person.
Please bring your wife and your good self.