Etymology
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sunrise (n.)

mid-15c., from sun (n.) + rise (v.); perhaps it evolved from a Middle English subjunctive, such as before the sun rise. Earlier in same sense were sunrist (mid-14c.); sunrising (mid-13c.). Compare sunset.

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Definitions of sunrise
1
sunrise (n.)
the first light of day;
Synonyms: dawn / dawning / morning / aurora / first light / daybreak / break of day / break of the day / dayspring / sunup / cockcrow
sunrise (n.)
atmospheric phenomena accompanying the daily appearance of the sun;
sunrise (n.)
the daily event of the sun rising above the horizon;
2
sunrise (adj.)
of an industry or technology; new and developing;
high-technology sunrise industries
From wordnet.princeton.edu