professional
UK: prəˈfeʃənəl | US: prəˈfeʃənəl
adj. relating to or characteristic of a profession or engaged in a specified activity as one's main paid occupation
n. a person engaged or qualified in a profession
n. a person competent or skilled in a particular activity
The word "professional" originates from the Latin "professio," meaning "public declaration." The root "pro-" (forward) combined with "fess" (from "fateri," to acknowledge) originally referred to vows taken when entering a religious order. Over time, it evolved to signify expertise in a field, reflecting the idea of publicly declaring one's commitment to a skilled occupation. The suffixes "-ion" and "-al" solidify its grammatical role as a noun or adjective.
She maintains a professional attitude even under pressure.
He is a licensed medical professional.
The team delivered a highly professional presentation.
Professional athletes train rigorously to maintain peak performance.
Her professional achievements earned her widespread recognition.