(electrical engineering) The use of the higher(positive) voltage level to represent the Boolean value 0 and the lower voltage(negative) level to represent the Boolean value 1.

An auxiliary verb used for negation in certain languages.

Alternative spelling of HIV negative

Not infected by HIV.

(optics) A uniaxial crystal, such as one of calcite, in which the extraordinary wave travels faster than the ordinary wave / A crystal that contains a cavity

plural of double negative

(derogatory, informal) A person who is considered excessively and disagreeably pessimistic.

(economics) The opposite of economic growth; economic decline.

(computing) A signed magnitude representation of zero in which the sign bit indicates a negative number.

(finance) The amount by which the market value of a property falls below the amount of the mortgage secured upon it. / (finance) The situation in which a property is worth less than its mortgage.