adjective Made up of liquid or moisture, usually (but not always) water.
Water is wet.
adjective Of an object, etc.: covered or impregnated with liquid, usually (but not always) water.
I went out in the rain and now my clothes are all wet.
adjective Of a burrito, sandwich, or other food: covered in a sauce.
adjective Of calligraphy and fountain pens: depositing a large amount of ink from the nib or the feed.
This pen’s a wet writer, so it’ll feather on this cheap paper.
adjective Of a sound recording: having had audio effects applied.
adjective Of weather or a time period: rainy.
It’s going to be wet tomorrow.
adjective Using afterburners or water injection for increased engine thrust.
This fighter jet's engine is rated for a maximum wet thrust of 450 kilonewtons, more than twice its max dry thrust, but the afterburner eats up a huge amount of fuel.