1.
idea, conception, inspiration
An idea or concept that one hits upon, especially a creative or original one. Emphasizes the act of conceiving or arriving at an idea, rather than the idea itself.
Usage
A somewhat literary or formal word for 'idea' or 'inspiration.' Unlike the general word アイデア, 着想 emphasizes the moment of conception — hitting upon something. It is often used in artistic, literary, and academic contexts.