Colonel/ˈkɜːrnl/ Definition 1 of 2Pro Tip 1/3Military Rank Used to identify military position, not used casually. The colonel issued new training orders. Pro Tip 2/3Not Spelled Phonetically 'Colonel' doesn't sound like it's spelled; it's pronounced like 'kernel'. She mistakenly wrote 'kernel' when she meant 'colonel'. Pro Tip 3/3Respectful Address Use as a formal title when addressing a colonel personally. Good morning, Colonel Smith.