customcustom

Custom comes from Middle English custume, from Anglo-Norman custume, from Latin cōnsuētūdō ‘custom, habit’, from cōnsuēscō ‘to accustom’.

1. Latinc. 75 BCE–200 CEsuēscō¹‘to become accustomed’
2. Latinc. 75 BCE–200 CEcōnsuēscō¹‘to accustom’
3. Latinc. 75 BCE–200 CEcōnsuētūdō¹‘custom, habit’
4. Anglo-Normanc. 1066–1400custume¹
5. Middle Englishc. 1150–1500custume¹‘a convention, tradition’
6. Englishearliest quotation c. 1589–1590custom¹

1. ¹ Wiktionary, English custom
2. Earliest quotation in Wiktionary’s entry: c. 1589–1590, Christopher Marlowe, The Famous Tragedy of the Rich Iew of Malta. […]: “Barabas, thy ships are safe, Riding in Malta Rhode;…”.