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Entry into the literary pantheon, Jackson says, requires meeting thresholds for quality and quantity, but after that, “adventitious circumstances take over.”

Williams’s radiant sound and adventitious origins have made her a key figure in a diverse dawn for the solo guitar.

Tomatoes have the ability to produce roots off their stems, known as adventitious roots.

Karhiders eat four solid meals a day, breakfast, lunch, dinner, supper, along with a lot of adventitious nibbling and gobbling in between.

"We have common memories and common experiences that bind us so closely together that no adventitious circumstances can wrench us apart," he wrote in one of his letters.