Definition of "AND"

AND¹

noun
plural ANDs
1. (logic) Alternative form of ∧, the conjunction operator.
2. (logic) The binary operator and, only true if both of two inputs is true. In infix notation.
verb
third-person singular simple present ANDs, present participle ANDing, simple past and past participle ANDed
1. (logic, transitive) To combine (a value) with another value by means of this operator.
  Quotations
  If an internal node is encountered that contains a mask, the search key is logically ANDed with the mask and another search is made of the subtree...
  2006, Gary R Wright, W Richard Stevens, The Implementation

adjective
comparative more AND, superlative most AND
1. (aviation) Initialism of airplane nose down.