It is poised to make one of the most significant directional changes in its 100-year history.

He argues that there are two elements in this definition, directional change and improvement according to some standard.

That is, is there a consistent directional change throughout the history of life on Earth?

In other contexts, evolution (term) can mean any gradual directional change.

We identified genes that demonstrated the same directional change in at least three of four comparisons.

"Our real goal is to achieve directional change," he said.

When confronted, they may hide using sudden directional changes and leaping.

We are less likely to group elements with sharp abrupt directional changes as being one object.

When airflow changes direction, a reaction force is generated opposite to the directional change.

And directional changes on final to keep him lined up.