noun
prospectus; written statement of purpose
A formal document outlining the aims and reasons for a project, organization, or event. Common in business, academic, and non-profit contexts.
新事業の趣意書を取引先に提出した。
We submitted a prospectus for the new business to our client.
学会設立の趣意書を作成しています。
We are drafting a statement of purpose for the establishment of the academic society.
提案書 is a suggestion or offer, often with specific details; 趣意書 is more about the fundamental intent.
Compound of 趣意 (purpose, intent) and 書 (document). The exact historical derivation is uncertain, but the word follows a common Sino-Japanese pattern for formal documents.