formal

It would represent the first formal engagement between the U.S. and North Korea in more than six years.

The deals personally linked U.S. and Gulf leaders, unlike the usual carrots and sticks of formal foreign policy.

The penacho’s formal title — “Quetzal Feather Headdress” — understates the grandeur of a one-of-a-kind piece with a back story stretching back more than half a millennium.

He has hinted at a possible fourth run for president since returning to office, but had so far stopped short of a formal announcement.

"They have three days of learning in reading, mathematics and writing, but this is far from a formal education as we know it," he added.