It means a superiority in evidence over that presented by the opposition.
Superiority in weight, force, importance, or influence.
It may be Poly Vinyl Chloride as in PVC pipe.
It's the diffusion of a substance across a biological membrane. An example would be osmosis; in osmosis, water molecules move from an area of high concentration to an area of low concentration.
HSE in the UK is the Health Service Executive.
It's something like caution or be careful in spanish.