noun
BAD : After dealing with customer enquiries for a year I was promoted to a higher rank and given my own office.
GOOD : After dealing with customer enquiries for a year I was promoted to a more senior position and given my own office.
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Rank usually refers to someone's position in the army, navy, police force etc, where there are fixed levels of authority such as sergeant or captain 'She joined the police force in 1990 and quickly rose to the rank of sergeant.'