To devise is to invent or plan something that is difficult or complicated in some way.

// The siblings devised a plan to clean the house from top to bottom with hopes of getting their parents to let them go to the concert.

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“The Timberwolves surprisingly advanced to the Western Conference finals last year before losing to the Mavericks. After a troublesome season, Minnesota returned before being thumped by the top-seeded Thunder. The series wasn't really close, and the Timberwolves ... will have to devise a way to compete in the Western Conference with the Lakers, Nuggets, Clippers, Spurs, Mavericks, and Warriors all chasing them.” — Gary Washburn, The Boston Globe, 1 June 2025

There’s something inventive about devise, a word that stems from Latin dividere, meaning “to divide.” By the time devise was being used in English, its Anglo-French forebear deviser had accumulated an array of senses, including “divide,” “distribute,” “arrange,” “order,” “plan,” “invent,” and “assign by will.” English adopted some of these and added new senses, such as “imagine” and “guess,” that have fallen out of use over time. Today devise is most commonly used as a synonym of invent or plot in situations where the objective is difficult or complicated. Note that devise is often confused with another dividere (and deviser) descendent: device refers to a technique, method, tool, or small machine or gadget. One way to help keep their spellings straight is to remember that ice, usually a noun, is found at the end of the noun device, not the verb devise.