Online Definition–adjective | 1. | operating under the direct control of, or connected to, a main computer. |
| 2. | connected by computer to one or more other computers or networks, as through a commercial electronic information service or the Internet. |
| 3. | of or denoting a business that transmits electronic information over telecommunications lines: an on-line bookstore. |
| 4. | available or operating on a computer or computer network: an on-line dictionary. |
| 5. | by means of or using a computer: on-line shopping. |
| 6. | Radio. (of a network) supplying affiliated stations with all or a substantial part of their programming. |
| 7. | Television. of or pertaining to the final editing of a videotaped program. |
| 8. | done or accomplished while in operation or active service: on-line maintenance. |
| 9. | located on major routes or rail lines: on-line
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industries. |
–adverb | 10. | with or through a computer, esp. over a network. |
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From Dictionary
Backup Definition–noun | 1. | a person or thing that supports or reinforces another. |
| 2. | a musician or singer or group of musicians or singers accompanying a soloist: a singer with a three-man backup that plays cello, bass, and guitar. |
| 3. | an overflow or accumulation due to stoppage, malfunctioning, etc.: a sewage backup; a backup of cars at the tollbooth. |
| 4. | a person, plan, device, etc., kept in reserve to serve as a substitute, if needed. |
| 5. | Computers. | a. | a copy or duplicate version, esp. of a file, program, or entire computer system, retained for use in the event that the original is in some way rendered unusable. |
| b. | a procedure to follow in such an event. |
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| 6. | Bowling. a ball that curves in a direction corresponding to the bowling hand of the bowler. |
–adjective | 7. | (of a person, plan, device, etc.) held in reserve as a substitute if needed: a backup driver; a backup generator. |
| 8. | performing a secondary or supporting function: A drummer and guitarist are the singer's backup musicians. |
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From Dictionary
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