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must v. v.aux. 1.To be obliged or required by morality, law, or custom. 2.To be compelled, as by a physical necessity or requirement. 3.Used to express a command or admonition. 4.To be determined to; have as a fixed resolve. 5.Used to indicate inevitability or certainty ex. We all must die. 6.Used to indicate logical probability or presumptive certainty.