0 the level of poison contained in a drug, or the ability of a drug to poison the body:
1 the quality of being poisonous, or the degree to which something is poisonous
2 the fact that something is poisonous or the degree to which it is poisonous:
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.