adventitious

adj

• ① 偶然的(=accidental);外来的;【医】偶发的
  • an adventitious disease偶发病(后天性的疾病)
  • The adventitious birth of our fourth child completely changed our plan.不在我们预计中的第四个孩子的出生,完全改变了我们的计划。
  • His presence was purely adventitious.他的莅临纯粹是偶然。