1. a liquid product used after shampooing to make hair soft and manageable
2. a device or substance that improves the condition or quality of something
3. an air conditioning unit that cools and dehumidifies indoor air
Usage: informal

Examples

• She applied conditioner to her hair after shampooing.
• The conditioner made her curls softer and less tangled.
• We need a soil conditioner to improve the garden’s drainage.
• The fabric conditioner keeps clothes feeling smooth.
• Turn on the conditioner; it’s getting hot in here.
• The old conditioner broke down during the heat wave.
• This leather conditioner will restore the couch’s appearance.