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".

1. A reference to an idea or opinion that has been formed beforehand, especially without evidence or as a result of previous judgement: Mrs. Snow had preconceived notions about teenagers being superficial, listening to rock music, and staying out the whole night!
2. Descriptive of something that is formed in the mind in advance, particularly if it is based on little or no information or experience and reflecting personal beliefs: Jack was very prejudiced about dogs and therefore had preconceived ideas that they always barked loudly during the night and smelled bad!