A small line or fold in something, especially fabric or the skin, that is caused by crumpling, folding, or aging. She noticed a new wrinkle on her forehead when she looked in the mirror.
A minor difficulty or complication in a plan or process. The project was going smoothly until a wrinkle in the supply chain caused delays.
A clever innovation or trick. The new software update includes a wrinkle that makes it easier to manage tasks.