Dictionary apps have obviated the need for printed dictionaries.

Going carless obviates the need for a dedicated parking space at home.

The employee's voluntary resignation obviated the necessity of firing him.

Many languages have developed reflexive pronouns, by means of which many ambiguities are obviated.

These days, a smart phone with a good data plan can obviate the need for a land line.

The need for a ferry was obviated once the bridge was built.