professional

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Professional

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professional (plural professionals)

A person who belongs to a profession
A person who earns his living from a specified activity
An expert.
- 1934, Rex Stout, Fer-de-Lance, 1992 Bantam edition, ISBN 0553278193, page 97:
  I have learned that there is a person attached to a golf club called a professional. Find out who fills that post at the Green Meadow Club; […] invite the professional, urgently, to dine with us this evening.

person who belongs to a profession

Irish: gairmí m
Japanese: プロフェッショナル (ja) (purofesshonaru), プロ (puro)
Maori: mātanga
Portuguese: profissional (pt) m, f
Russian: профессионал (ru) m (professionál), профессионалка (ru) f (professionálka)
Spanish: profesional (es) m, f, profesionista m, f (Mexico)

person who earns his living from a specified activity

Arabic: محترف m (muḥtarif), محترفة f (muḥtarifa)
Egyptian Arabic: محترف m (muḥtaref), محترفة f (muḥtarefa)
Catalan: professional (ca) m, f
Dutch: beroeps (nl), professional (nl) m
Finnish: ammattilainen, ammattimies
German: Profi (de) m, Professioneller m, Professionelle f
Greek: επαγγελματίας (el) m, f (epangelmatías)

Polish: zawodowiec m, profesjonalista m
Portuguese: profissional (pt) m, f
Russian: профессионал (ru) m (professionál), профессионалка (ru) f (professionálka)
Spanish: profesional (es) m, f, profesionista m, f (Mexico)
Swedish: proffs (sv) n
Thai: มืออาชีพ

expert

Catalan: professional (ca)
Chinese:
Mandarin: 專家, 专家 (zh) (zhuānjiā)
Czech: profesionál m
Dutch: deskundige (nl), expert (nl) m
Finnish: ammattilainen, ekspertti (fi), asiantuntija (fi)
French: professionnel (fr) m, professionnelle (fr) f
German: Profi (de) m
Greek: επαγγελματίας (el) m, f (epangelmatías), επιτηδευματίας (el) m, f (epitidevmatías)

Japanese: プロフェッショナル (ja) (purofesshonaru), プロ (puro), 専門家 (せんもんか, senmonka)
Polish: profesjonalista m, zawodowiec m
Portuguese: profissional (pt) m, f
Russian: профессионал (ru) m (professionál), профессионалка (ru) f (professionálka), специалист (ru) m (specialíst), специалистка (ru) f (specialístka), эксперт (ru) m (ekspért)
Swedish: proffs (sv) n, expert (sv) c

professional (comparative more professional, superlative most professional)

Of, pertaining to, or in accordance with the (usually high) standards of a profession.
- 1907, Robert Chambers, chapter 2/1, The Younger Set^[1]:
  His forefathers had been, as a rule, professional men—physicians and lawyers ; his grandfather died under the walls of Chapultepec Castle while twisting a tourniquet for a cursing dragoon ; an uncle remained indefinitely at Malvern Hill ; […] .
That is carried out for money, especially as a livelihood.
(by extension) Expert.