名詞 mercenary:

1. a person hired to fight for another country than their own
   同義詞：soldier of fortune

形容詞 mercenary:

1. marked by materialism
   同義詞：materialistic, worldly-minded
2. used of soldiers hired by a foreign army
   同義詞：freelance
3. profit oriented
   同義詞：mercantile, moneymaking

1. A medieval mercenary.
   中世紀(jì)雇傭軍
2. A German mercenary in the British army in America during the Revolutionary War.
   黑森雇傭兵在美國革命戰(zhàn)爭時期，在美國的英國軍隊中的德國雇傭兵
3. Those mercenaries were hired to fight.
   那些雇傭兵被雇傭來打仗。
4. His actions are entirely mercenary.
   他的行為完全是為了錢。

mer.ce.nar.y

adj.（形容詞）
Motivated solely by a desire for monetary or material gain.
唯利是圖的：以獲取金錢或物質(zhì)為唯一動機(jī)的
Hired for service in a foreign army.
雇傭的：被外國軍隊雇傭來服役的
n.（名詞）
【復(fù)數(shù)】 mer.ce.nar.ies
One who serves or works merely for monetary gain; a hireling.
唯利是圖的人：僅為獲取金錢而服務(wù)或工作的人；以金錢為目的人
A professional soldier hired for service in a foreign army.
雇傭兵：被外國軍隊雇傭來服役的職業(yè)軍人

來源：
Middle English mercenarie [a mercenary]
中古英語 mercenarie [ 雇傭兵]
from Old French mercenaire
源自 古法語 mercenaire
from Latin mercôn3rius
源自 拉丁語 mercôn3rius
from mercôs [wages, price]
源自 mercôs [工資，價錢]

【引伸】
mer.cenar.ily
adv.（副詞）
mer.cenar.iness
n.（名詞）