For illiteracy to be completely wiped out it is important that we all become literate. And it will be like obliterating illiteracy. So, it is clear that obliterate means to destroy completely.
Meaning of obliterate: (Verb)
1) To destroy completely
2) To remove the marks completely
Usage of obliterate:
1) He has obliterated the old parchment.
2) His writings are not obliterable. (Adjective)