purposive

1. (psychology) Pertaining to purpose, as reflected in behaviour or mental activity.Examples: "Ursula could not believe the air in her nostrils. It seemed conscious, malevolent, purposive in its intense murderous coldness."; "The question at once arises whether medieval thinkers really believed that what we now call inanimate objects were sentient and purposive."

2. (grammar) Of a clause or conjunction: expressing purpose.Examples: "Many scholars suggest that […] the increase in the use of the to-infinitive in Middle English took place at the expense of the bare infinitive (i.e. an infinitive without the marker to). […] due to the loss of verbal inflections, it became difficult to distinguish the infinitival form from other verbal forms. As a result […] to began to function as a mere marker of the infinitive, losing its original ‘purposive’ sense […]"