Final answer:
The word 'president' should be capitalized when it refers to a specific job but not when used generically or as a common noun.
Step-by-step explanation:
The word president should be capitalized when it refers to a specific job. For example, 'President of the United States' is capitalized because it is referring to a specific role. On the other hand, if the word president is used generically or as a common noun, it should not be capitalized. For instance, if you say 'my uncle is a president at his company,' it should not be capitalized.
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