| Answer | Crossword Clue |
|---|---|
| TRIAD | Union of three |
| triad | a union or group of three trinity |
| triphthong | A union of three vowels (letters or sounds) pronounced in one syllable (as in some pronunciations of our) |
| triphthongs | A union of three vowels (letters or sounds) pronounced in one syllable (as in some pronunciations of our) |
| BENELUX | Three-part European union |
| IDO | Three-letter, union-forming phrase |
| ACELA | Train that serves three Union Stations |
