0 the process of having a medical operation to make it impossible to have children:
1 the process of making something completely clean and free from bacteria:
2 the process of having a medical operation to make it impossible to produce young, or the condition of being unable to produce young:
3 the process of making something completely clean and free from bacteria:
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.