Trice/traɪs/ Definition 1 of 2Pro Tip 1/3Instantaneous Notion Conveys the idea of something happening almost instantly, emphasizing swiftness. He finished the task in a trice. Pro Tip 2/3Colloquial Usage Most common in informal speech, not usually found in formal writing. She said she'd join us in a trice. Pro Tip 3/3Hyperbolic Impression Often used to exaggerate how quickly something can be done. Grab a snack? I'll do it in a trice!