on·set 
(ŏnsĕt′, ôn-)
(ŏnsĕt′, ôn-)n.
1. The beginning or start of something: the onset of a cold.
2. Linguistics The part of a syllable that precedes the nucleus. In the word nucleus (nklē-əs), the onset of the first syllable is (n), the onset of the second syllable is (kl), and the last syllable has no onset.
3. Archaic An attack by military forces; an assault.
- Indo-European root: dhghem-
- Indo-European root: dhgh(y)es-
- Indo-European root: dhreg-
- Indo-European root: dhreibh-
- Indo-European root: dhreu-
- Indo-European root: dhugəter-
- Indo-European root: dhwer-
- Indo-European root: dhē-
- Indo-European root: dhē(i)-
- Indo-European root: dhēs-
- Indo-European root: dhīgw-
- Indo-European root: dlegh-
- Indo-European root: dn̥ghū-
- Indo-European root: dus-
- Indo-European root: dwo-
- Indo-European root: dyeu-
- Indo-European root: dā-
- Indo-European root: dō-
- Indo-European root: ed-
- Indo-European root: eg
- Indo-European root: eghs
- Indo-European root: egwh-
- Indo-European root: ei-
- Indo-European root: eis-
- Indo-European root: ekwo-