How to sign: a mutually agreed delay in the date set for the completion of a job or payment of a debt
"they applied for an extension of the loan";
Categories: delay, hold, postponement, time lag, wait
How to sign: a string of characters beginning with a period and followed by one to three letters; the optional second part of a PC computer filename
"most applications provide extensions for the files they create"; "most BASIC files use the filename extension .BAS";
Similiar / Same: filename extension, file name extension
Categories: string
How to sign: act of stretching or straightening out a flexed limb
Categories: stretching
Within this category: hyperextension
How to sign: an addition that extends a main building
Similiar / Same: annex, annexe, wing
Categories: add-on, addition, improver
Within this category: ell