n. time taken for radioactivity etc. to fall to half its original value. halflight n. dim imperfect light. halfmast n. position of a flag halfway down a mast, as a mark of respect for a deceased person.
n. time taken for radioactivity etc. to fall to half its original value. halflight n. dim imperfect light. halfmast n. position of a flag halfway down a mast, as a mark of respect for a deceased person.
