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multicultural
relating to many cultures
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multilateral
having many different sides
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multilingual
having the ability to speak many languages
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multimedia
combined use of many forms of communication and/or entertainment
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multiply
to increase in number; to make many of
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multitude
a large number of things; a group with many members
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multiuse
having many uses
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multivitamin
a pill or tablet that includes many nutrients needed for health