1. To form an opinion about something in advance: Mrs. Timmons conceptualised or preconceived ideas how to raise her children, even before she had any herself!
2. To form a premature notion or idea before possessing full or adequate knowledge or experience about it: David thought that his wife was preconceiving a life of leisure after giving birth to her first baby before knowing the real facts about baby care!
3. Etymology: from Latin concipere; from pre, "before" + capere, "to take".