di·rec·tor (dĭ-rĕktər, dī-)
1. One that supervises, controls, or manages.
2. A member of a group of persons chosen to control or govern the affairs of an institution or corporation.
3. A person who supervises the creative aspects of a dramatic production or film and instructs the actors and crew.
4. The conductor of an orchestra or chorus.
5. An electronic device that continually calculates and displays information used for firing weapons at moving targets, such as missiles or aircraft.
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.