IPA: /kwɪnˈkʌŋkʃəl/
KK: /kwɪnˈkʌŋkʃəl/
Relating to or arranged in a pattern of five points, with four points forming a square or rectangle and the fifth point at the center.
The garden was designed in a quincunxial layout, with trees planted at each corner and one in the middle.
Quincunxial is formed from "quinque" (meaning five) and "unx" (meaning one twelfth, from the Latin word for a twelfth part). The term refers to a specific arrangement of five objects, typically in a square or rectangle, with one at each corner and one in the center, resembling the pattern on the face of a die showing five.
Think of the word 'quincunxial' as relating to 'five' ('quinque') arranged in a specific way, like the five dots on a die.
No commonly confused words.