(geography) The total number of deaths in a year among infants under one year of age for every 1,000 live births in a society.

Synonym of rational egoism (“theory espoused by Ayn Rand”)

(Australia, slang) To travel on a train without paying the fare.

Synonym of ration stamp

A stamp or card issued by a government to allow the holder to obtain food or other commodities that are in short supply during wartime or in other emergency situations when rationing is in force.

celestial horizon

(chemistry) The ratio of the percent of one enantiomer in a mixture to that of the other

Alternative form of PE ratio

Abbreviation of price-earnings ratio.

plural of iron ration