noun
plan; scheme; undertaking; plot
Refers to a deliberate plan or scheme, often with a connotation of ambition or risk. Can be neutral (business project) or negative (conspiracy).
彼の新事業の企ては、多くの投資家を惹きつけた。
His plan for a new business venture attracted many investors.
その企て
The undertaking ended in failure.
敵の企てを未然に防ぐ。
We thwart the enemy's plot before it happens.
計画 is a general, neutral word for a plan or schedule. 企て often implies a more ambitious, risky, or secretive scheme.
企画 is a plan or proposal, often in a business or creative context. 企て can sound more like a personal or covert undertaking.
Noun form of the verb 企てる (くわだてる, 'to plan, to scheme'). The kanji 企 means 'plan' or 'undertake'.