adj. The possessive form of it.
Used as a modifier before a noun: The airline canceled its early flight to New York.
Usage Note: Its is the possessive form of the pronoun it and is correctly written without an apostrophe: The cat licked its paws. The contraction it's (for it is or it has) should always have an apostrophe: It's the funniest show I've seen in years. It's been three years since our last trip to Los Angeles.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.