oxygen deficiency; oxygen shortage; lack of oxygen
filling a vacancy; supplementation; substitute; deputy; alternate
having no money; lack of money
vacant position; vacancy; opening; unfilled position
absence due to illness; sick leave
authorized absence; permission of absence from class(es)
running out of gasoline (petrol)
failure to pay one's compliments; omission of courtesy
intermittence; intermittent
removal; omission; lusting
omission of a character; omitted character; blank type; insertion of blank spaces before and after the names of dignitaries (as a sign of respect)
fragment (e.g. of works); incomplete set; incomplete state
to bridge a gap; to supply a lack
missing issue (of magazine)
piece of writing with a missing part; missing part (sentence, passage, etc.); lacuna
absence for personal reasons