We found 23 dictionaries that define the word line of sight:

General (16 matching dictionaries)

1. line of sight: Merriam-Webster
2. line of sight: Oxford Learner's Dictionaries
3. line of sight: American Heritage Dictionary of the English Language
4. line of sight: Collins English Dictionary
5. line of sight: Vocabulary.com
6. line of sight: Wordnik
7. line of sight: Cambridge Advanced Learner's Dictionary
8. line of sight: Wiktionary
9. line of sight: Infoplease Dictionary
10. line of sight: Dictionary.com
11. Line of Sight (Mike Maden novel), Line of Sight (novel), Line of Sight, Line-of-sight, Line-of-sight (disambiguation), Line-of-sight (missile), Line of sight (gaming), Line of sight (video games), Line of sight: Wikipedia, the Free Encyclopedia
12. line of sight: Rhymezone
13. line of sight: FreeDictionary.org
14. line of sight: Mnemonic Dictionary
15. line of sight: TheFreeDictionary.com
16. Line of Sight (book): Wikipedia, the Free Encyclopedia

Art (1 matching dictionary)

17. Line of Sight (LOS): Miniature Wargaming Glossary

Business (2 matching dictionaries)

18. line of sight: Legal dictionary
19. Line-of-sight: Radio Programming and Production

Computing (2 matching dictionaries)

20. Technopedia (No longer online)
21. line of sight: Encyclopedia

Medicine (1 matching dictionary)

22. line of sight: Merriam-Webster Medical Dictionary

Tech (1 matching dictionary)

23. Glossary of Meteorology (No longer online)

(Note: See line_of_sighting as well.)

Definitions from Wiktionary (line of sight) ▸ noun:  A straight line along which an observer has a clear view. ▸ noun:  (weaponry) The line which passes through the front and rear sight, at any elevation, when they are sighted at an object. Similar: line of vision, sightline, straight line, one-line sky, visual angle, skyline, clearway, straightway, sunline, sight triangle, more... Opposite: blind spot, obstruction, hidden Phrases: line of sight propagation, electronic line of sight, Semi-automatic command to line of sight, Manual command to line of sight, in the line of sight, more... Adjectives: bone, perspective, superwide, single file, spacing, cyclopean, viz, focal, alpha, spacy, mosaic ▸ Words similar to line of sight ▸ Usage examples for line of sight ▸ Idioms related to line of sight ▸ Wikipedia articles (New!) ▸ Words that often appear near line of sight ▸ Rhymes of line of sight ▸ Invented words related to line of sight