IPA: /kənˈdɪʃənə/
KK: /kənˈdɪʃənər/
A product used to improve the quality or manageability of hair or other substances, often applied after washing to make hair softer and easier to style.
She applied conditioner to her hair after shampooing to keep it smooth and shiny.
Conditioner → It is formed from "condition" (from Latin "conditio", meaning agreement or state) and the suffix "-er" (meaning one who). A conditioner is one who conditions or modifies a state, particularly in the context of hair or other materials.
Think of someone who modifies or improves a state — that's what a conditioner does, it helps to improve the condition of hair or other materials.