词根:propr, proper, propri = proper(适当的), one's own(自己

  词根来自拉丁语的propr 意为one's own。
  (*拉丁文proprius(=proper,own)——英文字根字典)

同源词:

1. propriety (自身所固有的性质propr(=one's own))
  n.(行为等的)得体;妥当;适当;礼貌;(pl.)礼仪,礼节
  proper adj. 合适的,妥当;有礼貌的;本身的
  properly adv.合适地;有礼貌地;彻底地
  proprietor n.所有者;经营者;房东
  proprietorship n.所有权《-ship = 抽象名词后缀》
  I question the propriety of his promoting his own son to V.P. at such an early age. 我怀疑他将自己如此年轻的儿子提升为副总裁是否妥当。

2. appropriate
  v.占用,挪用,盗用;拨出(款项等)
  adj.适合的,适当的 *ap < ad(=to,near)
  Don't appropriate other's ideas. 不要盗用别人的见解。
  appropriate $500,000 for the new school buildings 为建新校舍拨款50万美元
  The legislature appropriated the funds for the university.州议会为那所大学拨了款。
  Sports clothes are not appropriate for a formal wedding.运动服不适合正式的婚礼。
 
3. appropriation
  n.私用,挪用(资金);拨给的费用 *ap<ad(=to,near)
  make an appropriation for payment of debts 为了偿还债务而支出

4. expropriate
  v.没收(财产);征用(土地等的)使用权;夺取所有权 *ex(=out,away)
  expropriation n.没收;征用

5. impropriety
  n.不适当;不正当的行为;错误的词句《im- = in- =not》

6. misappropriate
  v.误用;侵占;盗用(不当地使用)《mis- = wrong》
  misappropriation n.误用;侵占;盗用