What does "yankeeism" mean?

An American word, phrase or custom; an Americanism.

What is a synonym for "yankeeism"?

Common synonyms include: americanism, anglicism.

noun

noun ·Rare ·Advanced level

Noun

1
An American word, phrase or custom; an Americanism.
"When he was excited, the Yankeeisms of his youth came back to him."

"When he was excited, the Yankeeisms of his youth came back to him."

From Yankee + -ism.