What is behoveful? (From Shakespeare's Romeo and Juliet)

Necessary.

Mother: What, are you busy, ho? Need you my help?
Juliet: No, madam; we have culled such necessaries / As are behoveful for our state tomorrow. / So please you, let me now be left alone, / And let the nurse this night sit up with you; / For I am sure you have your hands full all / In this so sudden business.
From Shakespeare's Romeo and Juliet (Act IV, Scene 3).