• 1A Boolean operator which gives the value one if and only if all the operands are one, and otherwise has a value of zero.

    1. 1.1A circuit which produces an output signal only when signals are received simultaneously through all input connections.
      • ‘It is similarly easy to implement an AND gate with two relays.’
      • ‘Using AND gates the researchers can synchronize the time-gated and non-gated signals to within 3 ns.’
      • ‘A vehicular crash discrimination system incorporates first and second crash sensors operatively coupled to a logic AND gate, which activates a safety restraint system.’
      • ‘An AND gate, for instance, receives two input bits and produces one output.’
      • ‘The AND gate performs a logical ‘and ‘operation on two inputs, A and B.’’


1 It is still widely taught and believed that conjunctions such as and (and also but and because) should not be used to start a sentence, the argument being that a sentence starting with and expresses an incomplete thought and is therefore incorrect. Writers down the centuries have readily ignored this advice, however, using and to start a sentence, typically for rhetorical effect, as in the following example: What are the government's chances of winning in court? And what are the consequences? 2 A small number of verbs, notably try, come, and go can be followed by and with another verb, as in sentences like we're going to try and explain it to them or why don't you come and see the film? The structures in these verbs correspond to the use of the infinitive to, as in we're going to try to explain it to them or why don't you come to see the film? Since these structures are grammatically odd—for example, the use is normally only idiomatic with the infinitive of the verb and not with other forms (i.e. it is not possible to say I tried and explained it to them)—they are regarded as wrong by some traditionalists. However, these uses are extremely common and can certainly be regarded as part of standard English. 3 For information about whether it is more correct to say both the boys and the girls or both the boys and girls, see both 4 Where items in a list are separated by and, the following verb needs to be in the plural: see or