Kind of number

• Referring to some numbers Adrian regularly used in exam
• 21st, e.g.
• Fifth, e.g.
• Second, perhaps, to have spoken about loud noise
• First or second, say
• First, second, or third, e.g.
• Rod left in a split second, maybe

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
late 14c., "regular, ordinary," from Old French ordinel and directly from Late Latin ordinalis ""showing order, denoting an order of succession," from Latin ordo (genitive ordinis ) "row, series" (see order (n.)). Meaning "marking position in an order or ...

Wikipedia Word definitions in Wikipedia
Ordinal may refer to: Ordinal data , a statistical data type consisting of numerical scores that exist on an arbitrary numerical scale Ordinal date , a simple form of expressing a date using only the year and the day number within that year Ordinal indicator ...