con·grat·u·late (kən-grăchə-lāt′, -grăj-, kəng-)
tr.v. con·grat·u·lat·ed, con·grat·u·lat·ing, con·grat·u·lates
To express one's joy or good wishes to (someone) regarding that person's achievement or good fortune: congratulated her on her promotion.
[Latin congrātulārī, congrātulāt- : com-, com- + grātulārī, to rejoice (from grātus, pleasing; see gwerə-2 in the Appendix of Indo-European roots).]
con·gratu·la·to′ry (-lə-tôr′ē) adj.
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.