These disruptive encounters occur at an average of once every 45 million years.

The first encounter with this plant occurred while attending a summer party.

Robert's first encounter with him occurs while he is looking for some lost horses.

The Army has not said when the reported encounters occurred.

My most rewarding encounter of this sort occurred in Greece.

This is true even though most encounters occur at a range of less than seven feet.

Their first encounter occurs around 1940 on the courthouse lawn.

"Of course," she said brightly, as though the previous encounter had occurred just yesterday.

But this is believed to be the first one to say such encounters occurred on the last night he was alive.

My encounter with this phenomenon occurred some years ago in Nice while looking for a hotel.