Meanings

lower half

the greater part

majority

latter half of one's life

second half

three-stroke alarm

three and a half lines

semicircular canals (of the inner ear)

four and a half tatami mats

quarter (of a year)

first half

first half of the year

western hemisphere

halving

first half of a game

the first half-year

majority

middle

halfway

last quarter (of the year)