1) Exclusively Saxon word 2) Exclusively Anglo word 3) Planned 4) Planned in advance 5) Plotted 6) Premeditated 7) Thought of previously 8) Word of purely Anglo origin 9) Word with Anglo-Saxon origins 1) Plotted 2) Premeditated 
• (n.) Premeditation. • (a.) Premeditated; prepense; previously in mind; designed; as, malice aforethought, which is required to constitute murder.
A·fore'thought` adjective Premeditated; prepense; previously in mind; designed; as, malice aforethought , which is required to constitute murder. Bouvier. 
As in 'malace aforethought'. Premeditated; the length of time during which the accused has entertained the thought of committing the offence is not very material, provided he has in fact entertained such thought; he is thereby rendered criminal in a greater degree than if he had committed the offence without premeditation.
thought of previously; premeditated (usually used predicatively): with malice aforethought.