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Dictionary comes from Medieval Latin dictiōnārium, from Latin dictiō ‘a speaking’, and ultimately from Proto-Indo-European *deyḱ- ‘to point out’.

1. Proto-Indo-Europeanc. 4500–2500 BCE*deyḱ-¹‘to point out’reconstructed
2. Proto-Indo-Europeanc. 4500–2500 BCE*déyḱeti¹‘to be pointing out’reconstructed
3. Proto-Italicc. 1500–700 BCE*deikō¹‘to show’reconstructed
4. Latinc. 75 BCE–200 CEdīcō¹‘to speak’
5. Latinc. 75 BCE–200 CEdictiō¹‘a speaking’perfect past participle of dīcō
6. Latinc. 75 BCE–200 CEdictiōnārius¹
7. Medieval Latinc. 600–1500dictiōnārium¹
8. Middle Englishc. 1150–1500dixionare¹
9. Englishearliest quotation 1864dictionary¹

1. ¹ Wiktionary, English dictionary
2. Earliest quotation in Wiktionary’s entry: 1864, The Alphabeticals: “They [dictionary-makers] may have had their romance at home—may…”.