Etymology
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conditioner (n.)

c. 1600, "a bargainer," agent noun from condition (v.). Meaning "an agent that brings something into good condition" is from 1888; since c. 1960 usually in reference to hair care products. Before that, it often was short for air conditioner(1938).

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Definitions of conditioner

conditioner (n.)
exercise that conditions the body;
farm work can be a good conditioner
conditioner (n.)
a trainer of athletes;
conditioner (n.)
a substance used in washing (clothing or hair) to make things softer;
From wordnet.princeton.edu