名詞 professional:

1. a person engaged in one of the learned professions
   同義詞：professional person
2. an athlete who plays for pay
   同義詞：pro
3. an authority qualified to teach apprentices
   同義詞：master

形容詞 professional:

1. engaged in a profession or engaging in as a profession or means of livelihood
2. of or relating to or suitable as a profession
3. characteristic of or befitting a profession or one engaged in a profession
4. of or relating to a profession
5. engaged in by members of a profession

1. Don't wear those clothes to work; try to look more professional!
   別穿這些衣服去工作，要穿得象個(gè)專業(yè)人員的樣子。
2. That doctor has been accused of professional misconduct.
   那位醫(yī)生被指控違反醫(yī)德。
3. She is a real professional.
   她是個(gè)真正的專家。

pro.fes.sion.al

adj.Abbr. prof.（形容詞）縮寫(xiě) prof.

Of, relating to, engaged in, or suitable for a profession:
專業(yè)的，職業(yè)的：職業(yè)的、與職業(yè)相關(guān)的、從事職業(yè)的或適合職業(yè)的：
例句：
a professional field such as law; professional training.
專業(yè)領(lǐng)域，如法律；職業(yè)訓(xùn)練

Conforming to the standards of a profession:
符合職業(yè)標(biāo)準(zhǔn)的：
例句：
professional ethics.
職業(yè)道德

Engaging in a given activity as a source of livelihood or as a career:
從事專業(yè)的，職業(yè)的：從事某一特定活動(dòng)作為職業(yè)或謀生手段：
例句：
amateur and professional actors.
業(yè)余和專業(yè)演員

Performed by persons receiving pay:
職業(yè)性的：接受金錢(qián)報(bào)酬的人們從事的：
例句：
professional football.
職業(yè)足球

Having or showing great skill; expert:
專業(yè)化的：具有或表現(xiàn)出高超技藝的；專家的：
例句：
a thoroughly professional repair job.
完全專業(yè)化的修理工作

n.Abbr. prof.（名詞）縮寫(xiě) prof.
A person following a profession, especially a learned profession.
專業(yè)人員：從事某項(xiàng)職業(yè)的人，尤指有學(xué)問(wèn)的職業(yè)
One who earns a living in a given or implied occupation:
專業(yè)者：以特定職業(yè)為生的人：
例句：
hired a professional to decorate the house.
雇一名專業(yè)裝飾工來(lái)裝修房子

A skilled practitioner; an expert.
行家：技術(shù)熟練的行業(yè)者；專家

【引伸】
profes.sionally
adv.（副詞）