The term 'stewardess' refers specifically to a female attendant; 'steward' is the male equivalent. The stewardess, along with the steward, ensured a smooth flight.
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Historical Usage
'Stewardess' used to be more common, but now 'flight attendant' is preferred for gender neutrality. Back in the day, my aunt worked as a stewardess.
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Service Role
A stewardess is often associated with service tasks such as serving food and drinks. The stewardess prepared to serve the passengers their meals.