(mathematics) An ordinary trigonometric function

Of or pertaining to an amicable, kindly disposition.

(retronym, linguistics) Any human language that has evolved naturally in a community, usually in contrast to computer programming languages, to controlled natural languages, and to constructed languages such as Esperanto (although constructed languages are subject to change by natural forces among fluent speakers).

(Australia, regional) An area of grass beside a roadway, possibly with a few trees or shrubs, lying between the roadway proper and the footpath, if there is one; a tree lawn.

(mathematics) The logarithm in base e: either the function that given x returns y such that eʸ = x, or the value of y given by the function.

(biochemistry) Any compound produced naturally by a living organism; especially those compounds that are useful commercially

(immunology) A natural killer cell

A food that has been not been processed in any way that alters covalent bonds, and to which no artificial substance has been added.

Synonym of bad-tempered: easily or characteristically angered. / Synonym of malevolent: wishing bad upon others.

plural of natural logarithm