Mutiny- revolt or rebellion


Fatal loins-  mortal enemies


Star cross'd lovers-  fated to fall in love


Piteous-  creating the feeling to be sorry for or feel sorrow for
    (Their attempt to be together was piteous because in the end they both died.)


Strife-  feud; bitter conflict


Death-mark'd love- Their love will result in their death

Nought could remove-  nothing else could get rid of.... (it)
    (Only their death could end their parents fight.


Envious- jealous


Vestal livery- outfit or costume worn by court jesters
    (Jesters- people in the presence of the king used to make him laugh.)


Discourses- communication by talking or the act of talking


Entreat- ask for something; beg


Doth- another way to say third person singular 'do' in the present tense
    (Or does)