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Definition of On-line
1. Adjective. On a regular route of a railroad or bus or airline system. "On-line industries"
2. Adjective. Connected to a computer network or accessible by computer. "An on-line database"
Exact synonyms: Online
Category relationships: Computer Science, Computing
Similar to: Connected, Machine-accessible
Antonyms: Off-line
Category relationships: Computer Science, Computing
Similar to: Connected, Machine-accessible
Antonyms: Off-line
3. Adjective. Being in progress now. "On-line editorial projects"