Extension

a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename

the most direct or specific meaning of a word or expression; the class of objects that an expression refers to

amount or degree or range to which something extends

the ability to raise the working leg high in the air

act of expanding in scope; making more widely available

a mutually agreed delay in the date set for the completion of a job or payment of a debt

an addition that extends a main building

an addition to the length of something

the spreading of something (a belief or practice) into new regions

an additional telephone set that is connected to the same telephone line

an educational opportunity provided by colleges and universities to people who are not enrolled as regular students

act of stretching or straightening out a flexed limb