There is a strong case to be made for concentration.

The moment was critical and called for all my concentration.

There was both the time and the opportunity for concentration while we were walking.

She tested 165 children for concentrations of lead in their blood.

In a way I helped to provide a channel for their concentration.

The result is limited security that provides opportunity for concentration.

The area is famous for its concentration of love hotels.

He was not in the mood for concentration on things academic, anyway.

A brisk walk he found much better as an aid for concentration.

Rather, this dance called for strong presence and intense concentration.