Usually means: Initial illumination from a telescope.
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We found 20 dictionaries that define the word first light:

General (17 matching dictionaries)
  1. first light: Merriam-Webster
  2. first light: Oxford Learner's Dictionaries
  3. first light: Collins English Dictionary
  4. first light: Vocabulary.com
  5. first light: Cambridge Advanced Learner's Dictionary
  6. first light: Wiktionary
  7. first light: The Wordsmyth English Dictionary-Thesaurus
  8. first light: Infoplease Dictionary
  9. first light: Dictionary.com
  10. First Light (Easy Star All-Stars album), First Light (Family of Mann album), First Light (Freddie Hubbard album), First Light (Ganguly novel), First Light (Preston book), First Light (Stead novel), First Light (Wellum book), First Light (Wishbone Ash album), First Light (band), First Light (film), First Light (radio), First Light (radio program), First Light, First light (astronomy), First light (cosmology), First light: Wikipedia, the Free Encyclopedia
  11. first light: Rhymezone
  12. first light: FreeDictionary.org
  13. first light: Mnemonic Dictionary
  14. first light: TheFreeDictionary.com
  15. first light: Longman Dictionary of Contemporary English

Computing (1 matching dictionary)
  1. first light: Encyclopedia

Science (1 matching dictionary)
  1. FIRST LIGHT: Zoom Astronomy Glossary

Tech (1 matching dictionary)
  1. DOD Dictionary of Military Terms (No longer online)

(Note: See first_lights as well.)

Definitions from Wiktionary (first light)

noun:  The time when light first appears in the morning; dawn, especially the start of dawn.
noun:  (astronomy) The first use of a telescope or other instrument to capture an astronomical image.

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