means A word, phrase, or sequence that reads the same forwards and backwards, like 'level' or 'racecar'.

from From the Greek 'palindromos,' meaning 'running back again' — built from 'palin' ('again, back') and 'dromos' ('a running,' the same root that gives us 'hippodrome' and 'aerodrome'). So a palindrome literally retraces its own steps, sprinting to the end only to discover it has arrived right back where it began. The English word emerged in the 17th century, when wordsmiths grew fond of such symmetrical games.