an essential and distinguishing attribute of something or someone

having great power or force or potency or effect

lacking power

the quality of lacking strength or power; being weak and feeble

capacity to produce strong physiological or chemical effects

(chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent)

(biology) a relative capacity to unite or react or interact as with antigens or a biological substrate

superiority in power or influence

power to influence or coerce

having great power or force or potency or effect

lacking power