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Indicate comes from Latin indicātus, participle of indicō ‘to point out’, from in- + dicō ‘to declare, originally to point’.

1. Latinc. 75 BCE–200 CEdicō¹‘to declare, (originally) to point’
2. Latinc. 75 BCE–200 CEindicō²‘to point out, indicate’
3. Latinc. 75 BCE–200 CEindicātus²‘indicated, pointed out’perfect passive participle of indicō
4. Englishearliest quotation 1903indicate²

1. ¹ Wiktionary, Latin indico
2. ² Wiktionary, English indicate
3. Earliest quotation in Wiktionary’s entry: 1903, How to indicate an engine: “To a person who is familiar with the use…”.