adj. ti·di·er, ti·di·est
a. Orderly and clean in appearance: keeps the apartment tidy.
b. Given to keeping things clean and in order: a tidy housekeeper.
2. Informal Adequate; satisfactory: a tidy arrangement.
3. Informal Substantial; considerable: a tidy sum.
v. ti·died, ti·dy·ing, ti·dies
To clean or put in order: tidied up the house.
To make things clean or orderly: tidied up after dinner.
n. pl. ti·dies
A decorative protective covering for the arms or headrest of a chair.
[Middle English tidi, in season, healthy, from tide, time; see TIDE1.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.