Delay line memory is a form of computer memory, now obsolete, that was used on some of the earliest digital computers. Like many modern forms of electronic computer memory, delay line memory was a refreshable memory, but as opposed to modern random-access memory, delay line memory was sequential-access. Analog delay line technology had been used since the 1920s to delay the propagation of analog signals. When a delay line is used as a memory device, an amplifier and a pulse shaper are connected between the output of the delay line and the input. The memory capacity is determined by dividing the...

Adjective: perennial ‎(not comparable)

1. Lasting or remaining active throughout the year, or all the time.
2. a perennial stream
3. (botany, of a plant) Having a life cycle of more than two years. Compare annual, biennial.
4. (figuratively) Continuing without cessation or intermission; perpetual; permanent; unceasing; never failing.
5. 1790, Edmund Burke, Reflections on the Revolution in France

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Noun: Wikipedia

1. perennial ‎(plural perennials)
2. A perennial plant; a plant that is active throughout the year or survives for more than two growing seasons. Compare annual, biennial.