mainly synonym chiefly a course designed primarily for specialists The problem is not primarily a financial one. The report is primarily concerned with aircraft safety. The person primarily responsible is the project manager.Extra examples Her view is that prejudice is caused primarily by ignorance. History is after all primarily about people. In the 1790s Britain was still primarily an agricultural country. It was the first book of poetry primarily designed for children. The new model is a car aimed primarily at commuters. You will need to prove that the marriage was not entered into primarily for immigration reasons.