preselector noun. [pri:sɪ'lɛktǝ] E20.
[from PRE- 1 + SELECTOR.]
1. Telephony. A switch in a telephone exchange which, when a receiver is lifted, automatically connects the calling line to a free trunk. E20.

2. Telecommunications. A tuned circuit preceding the first mixer in a superheterodyne receiver; an analogous filter in a microwave receiver. M20.

3. A gearbox that enables a driver to select a gear before the change is actually made. M20.

[TahlilGaran] English Dictionary ▲