性 - sex, gender, nature

sexually transmitted disease; STD; sexually transmitted infection; STI; venereal disease; VD

reason; reasoning power; (one's) sense

motherhood; maternity

woman; female

neutron

true character; real nature

durability

resistance (to heat, corrosion, etc.); tolerance (to a drug, pain, etc.)

the opposite sex

importance; gravity

(distinction of) sex; gender

alkalinity