Synonyms for Premeditation:

n.

conspiracy, agreement, preparation, planning, strategy, arrangements, tactic. intention (noun)
design, purpose, plan, plot, aim, intent.
plan (noun)
arrangement, design, aim, proposition, conception, expectation, idea, anticipation, intention, plot, blueprint, invention, scheme, coordination, contrivance, plan, chart.
predetermination (noun)
predetermination, foregone conclusion.
premeditation (noun)
forethought.

Other synonyms:

Other relevant words:
intent, strategy, preparation, purpose, forethought, planning.