The story
- Proto-Indo-European*teh₂g-
- Proto-Hellenic*tat͏̌t͏̌ō
- Ancient Greekτάσσω (tássō)
- Ancient Greekτακτικός (taktikós)
- New Latintactica
- Englishtactic
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- English todaytactical
Etymology from Wiktionary, CC BY-SA 4.0.