Correct spelling, explanation: prejudice appeared in Middle English and it has its origin in the Latin language, in which it had the form praejudicium. The meaning of this word used to be quite similar to the modern one as it used to mean to judge in advance. In modern English, the word can be found in both formal and informal contexts.

Definition of prejudice:
verb – to form an unfair opinion about somebody or something,
Despite all those things people say about him, try not to prejudice him.
verb – to affect in a negative way,
Sending that letter to your boss may prejudice your future in this company.
noun – an unfair or unreasonable opinion about somebody,
The responsibility of our school is to fight prejudice against disabled students.

Expressions with prejudice:
Some common expressions with prejudice include:
color prejudice – it’s when you treat people of different skin colors unfairly and badly,
The color prejudice in this school is still a common phenomenon.
deep-rooted prejudice – strong stereotypes about somebody or something,
Deep-rooted prejudices are the most difficult to handle.

Incorrect spelling, explanation: due to the pronunciation some users of English tend to make the mistake in the spelling of the word prejudice as they add an extra -d in the middle of the word, which results in the form predjudice. This version, however, is incorrect so make sure you do not spell the word this way.