Entry 1 sense Webster, 1913 Preconception /prēk-ən-sĕp'-shən/ · Pre·con·cep·tion · IPA /ˌpɹikənˈsɛpʃən/ 01 n. The act of preconceiving; conception or opinion previously formed. 1. The act of preconceiving; conception or opinion previously formed.