Definition of ironclad. 1  1 : sheathed in iron armor âused especially of naval vessels. 2  2 : so firm or secure as to be unbreakable: such asa : binding an ironclad oathb : having no obvious weakness an ironclad case against the defendant.
Best Answer: CR means a credit. If this appears on the balance due line of your statement, it means that you owe nothing and that you are that much ahead of future charges and no payment or acknowledgment is needed.
CR means that the student earned the credits for which the course was offered. N means that the student did not earn any credit even though the student registered for the course. Credits designated with CR or N are excluded from GPA computations. Students cannot audit a course offered on a credit/no credit basis.