induction (n.)
opening scene [of a play], initial step, preparation
1H4 III.i.2 [Mortimer to all] These promises are fair ... / And our Induction full of prosperous hope
2H4 [opening scene] Induction
R3 I.i.32 [Richard alone] Plots have I laid, inductions dangerous
R3 IV.iv.5 [Queen Margaret alone] A dire Induction am I witness to
TS [opening scene] Induction