Indian has 7 different meanings across 3 categories:
Noun · Adjective · Proper Noun
a native or inhabitant of India
"The visiting Indian shared stories about life in Mumbai with her new friends."
any of the languages spoken by Amerindians
"The linguist spent years cataloging rare variations in local Indian dialects before they disappeared forever."
A person from India.
"The curious student asked her Indian friend how to prepare traditional spices."
of or relating to or characteristic of India or the East Indies or their peoples or languages or cultures
"the Indian subcontinent"
"Indian saris"
of or pertaining to Native Americans or their culture or languages
"Native American religions"
"Indian arrowheads"
Of or relating to India or its people; or (formerly) of the East Indies.
"The famous Indian spice market in Mumbai was bustling with vendors selling saffron and cardamom."
In plain English: Something described as Indian is related to India, its people, culture, or language.
"The Indian restaurant down the street serves delicious curry and naan bread."
Any of the (unrelated) languages spoken by American Indians.
"Many different Indian languages are spoken across North America, yet they belong to distinct language families rather than a single group."
The word comes from Anglo-Norman and Middle French, originally meaning "of India." It was mistakenly applied to people in the Americas because early explorers thought the New World was part of Asia.