the.com/dictionary

means A reference work listing the words of a language in alphabetical order, with their meanings, pronunciations, and often their origins.

from From Medieval Latin dictionarium, built on Latin dictio meaning 'a saying, a word,' which traces back to dicere, 'to say or speak.' The term was reportedly first applied to such a wordbook by an English clergyman in the early 13th century, but the format we know — alphabetical, defined, exhaustive — took centuries to settle. So at its root, a dictionary is simply 'a collection of sayings,' which is a generous way to describe a book most people open only to lose an argument.