Definition of "reliable" in English

adjective

1. Suitable or fit to be relied on; worthy of dependence, reliance or trust; dependable, trustworthy

   • the best means, and the most reliable pledge, of a higher object

2. (signal processing, of a communication protocol) Such that either a sent packet will reach its destination, even if it requires retransmission, or the sender will be told that it didn't.

noun

1. Something or someone reliable or dependable

   • the old reliables