Definition of always-on adjective from the Oxford Advanced Learner's Dictionary

 

always-on

 adjective
adjective
BrE BrE//ˌɔːlweɪz ˈɒn//
 
; NAmE NAmE//ˌɔːlweɪz ˈɑːn//
 
, NAmE//ˌɔːlweɪz ˈɔːn//
 
[only before noun]
 
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of or connected with an Internet connection that is available to use at any time The phone maintains an always-on Internet connection. Always-on devices make for always-on people, and it's harder to draw boundaries between work and home life.