Ket/ket/ Definition 1 of 4Pro Tip 1/2Regional Variation In Northern England, 'ket' may be used instead of 'cat' in casual conversation. Look at the ket sleeping on the windowsill. Pro Tip 2/2Vintage Charm 'Ket' as a word for 'cat' has an old-fashioned feel and is rarely used by younger generations. My grandma always says 'ket' instead of 'cat'.