IPA: //ˈɒksɪdənt//
KK: /ˈɑksɪdənt/
A substance that causes another substance to lose electrons or hydrogen, often resulting in a chemical reaction.
Oxygen is a common oxidant that helps in the combustion process.
Oxidant is formed from "oxid" (from Latin "oxydare", meaning to combine with oxygen) and "-ant" (a suffix used to form nouns indicating an agent). The word "oxidant" refers to a substance that causes oxidation, meaning it facilitates the combination with oxygen.
Think of 'oxid' as relating to oxygen and '-ant' indicating an agent, so an oxidant is something that helps substances combine with oxygen.