Make (something bad or unsatisfactory) better.
Mid 18th century: alteration of meliorate, influenced by French améliorer, from meilleur ‘better’.
“Someone needs to ameliorate the whole country!”
“The reform did a lot to ameliorate living standards.”
With regard to, or at the level of, orders in a taxonomic system; according to an ordinal number, system, etc.; on an ordinal scale; with regard to order.
Mid 19th century; earliest use found in The Edinburgh Review. From ordinal + -ly.