surveillance

 
Pronunciation: /səˈveɪl(ə)ns, -ˈveɪəns/

noun

[mass noun]
  • close observation, especially of a suspected spy or criminal: he found himself put under surveillance by British military intelligence

Origin:

early 19th century: from French, from sur- 'over' + veiller 'watch' (from Latin vigilare 'keep watch')

Spelling help

Remember that surveillance is spelled -ei- in the middle, then a double l.