go-a·head (gōə-hĕd′) Informal
1. Permission to proceed: waiting for the go-ahead from the control tower.
2. Energetic assertiveness.
1. Characterized by energy and assertiveness: a go-ahead marketing strategy.
2. Providing a lead in a contest between competitors: scored the go-ahead goal to break the tie.
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.