English
enregiment
From en- + regiment.
Proto-Indo-European *h₃reǵ- ‘to straighten’
…
Proto-Italic *regō
Latin regō ‘rule’
Late Latin regimentum ‘direction for government’
Middle French regement
English regiment
Today it means
verb To form into a regiment.
Language periods are conventional ranges, not dates for this word.
Etymograph / enregiment