an idea or opinion, not only firmly, but often obsessively held and unlikely to be affected by the argumentes of others
It was a question of wanting an entirely new thing, of undertaking a thoroughgoing renovation of yourself, `;in all simplicity, with the fixed idea: ça ira .'; BNCI
`;Give yourself up to the fixed idea: to become a painter.'; BNCI
He's come here with a fixed idea, which he's been looking forward to for half his life. BNCI