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.
- premaxilla
- premaxillary
- premed
- premedical
- premeditate
- premeditation
- premeditative
- premeditator
- premenopausal
- premenstrual
- premenstrual dysphoric disorder
- premenstrually
- premenstrual syndrome
- premie
- premie
- premier
- premiere
- premiership
- premillenarian
- premillenarianism
- premillennial
- premillennialism
- premillennialist
- premillennially
- Preminger