3. The word-processing system of claim 2, wherein said display includes a cursor movable relative to characters therein and has a capacity less in number than the totality of characters in said alternative word and the definition thereof, such that a terminal portion of said totality of characters is displayable only by exclusion of said alternative word from said display upon scrolling of said terminal portion relative to said cursor to bring about display of said terminal portion; and means operating said third control independently of said exclusion of the at least one alternative word from the display.
3. The word-processing system of claim 2, wherein said display includes a cursor movable relative to characters therein and has a capacity less in number than the totality of characters in said alternative word and the definition thereof, such that a terminal portion of said totality of characters is displayable only by exclusion of said alternative word from said display upon scrolling of said terminal portion relative to said cursor to bring about display of said terminal portion; and means operating said third control independently of said exclusion of the at least one alternative word from the display. 4. The word-processing system of claim 3, wherein said means operating said third control comprises a register storing an address relating to said alternative word.