The difference between Imperative and Must
When used as nouns, imperative means the grammatical mood expressing an order (see jussive). in english, the imperative form of a verb is the same as that of the bare infinitive, whereas must means something that is mandatory or required.
Imperative is also adjective with the meaning: essential.
Must is also verb with the meaning: to do with certainty.
check bellow for the other definitions of Imperative and Must
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Imperative as an adjective:
Essential; crucial; extremely important.
Examples:
"It is imperative that you come here right now."
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Imperative as an adjective (grammar):
Of, or relating to the imperative mood.
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Imperative as an adjective (computing theory):
Having a semantics that incorporates mutable variables.
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Imperative as an adjective:
Expressing a command; authoritatively or absolutely directive.
Examples:
"'imperative orders"
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Imperative as a noun (uncountable, grammar):
The grammatical mood expressing an order (see jussive). In English, the imperative form of a verb is the same as that of the bare infinitive.
Examples:
"The verbs in sentences like "Do it!" and "Say what you like!" are in the imperative."
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Imperative as a noun (countable, grammar):
A verb in imperative mood.
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Imperative as a noun (countable):
An essential action, a must: something which is imperative.
Examples:
"Visiting Berlin is an imperative."
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Must as a verb (modal, _, auxiliary, defective):
To do with certainty; .
Examples:
"If it has rained all day, it must be very wet outside."
"You picked one of two, and it wasn't the first: it must have been the second."
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Must as a verb (modal, _, auxiliary, defective):
To do as a requirement; .
Examples:
"You must arrive in class on time.'' — the requirement is an imperative"
"This door handle must be rotated fully.'' — the requirement is a directive"
"Arise, and go into the city, and it shall be told thee what thou must do.'' (Bible, Acts 9:6)"
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Must as a verb (modal, _, auxiliary, defective):
said about something that is very likely, probable, or certain to be true
Examples:
"The children must be asleep by now."
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Must as a noun:
Something that is mandatory or required.
Examples:
"If you'll be out all day, a map is a must."
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Must as a noun:
The property of being stale or musty.
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Must as a noun:
Something that exhibits the property of being stale or musty.
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Must as a noun:
Fruit juice that will ferment or has fermented, usually grapes.
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Must as a verb (transitive):
To make musty.
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Must as a verb (intransitive):
To become musty.
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Must as a noun:
A time during which male elephants exhibit increased levels of sexual activity and aggressiveness .
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Must as a noun:
An elephant in this sexual and aggressive state.