Subjugate means bring under domination or control, especially by conquest. Maybe this.
Conciliatory means intended or likely to placate or pacify.
Explanation:
It could be either.
Think of a mans hair, most of the time men have short hair covering their heads. Would you consider hiding a baldspot with hair you still have Domination and Controling or Pacifying?
I mean the encyclopedia is 40 years old, and it cant be factual or reliable because she failed it. It never said anything about it being valuable so theres your answer. (I also knew the word beforehand but theres some sort of explanation)