instrumental singular of saṁyama (masculine noun)
Analysis. saṁ + yama: 'bringing together' (bringing impulses into one controlled state) + the action noun suffix -a; here inflected as instrumental 'by means of restraint'
Etymology. saṁ (together) + √yam (to hold, check, restrain); cognate with Latin stringere (to bind tight) and Sanskrit yamati. The prefix saṁ- shows how spatial 'together' becomes the abstract sense of unified control.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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