space bar

:  a period of time

:  its duration

:  a limited extent in one, two, or three dimensions :  distance, area, volume

:  to leave one or more blank spaces (as in a line of typing)

:  a straight piece (as of wood or metal) that is longer than it is wide and has any of various uses (as for a lever, support, barrier, or fastening)

:  a solid piece or block of material that is longer than it is wide

:  a usually rigid piece (as of wood or metal) longer than it is wide that is used as a handle or support

:  to fasten with a long, narrow piece of wood, metal, or other material :  to fasten with a bar (see ¹bar 1a)

:  to place bars across to prevent ingress or egress

:  to mark with straight stripes, bands, or lines that are much longer than they are wide :  to mark with bars (see ¹bar 4) :  stripe

:  except

:  a unit of pressure equal to 100,000 pascals

: barometer; barometric

: barrel