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Longman Dictionary of Contemporary English
generational
adjective
EXAMPLES FROM CORPUS
▪ But generational time can gradually lead on to an appreciation of dates and time-lines.
▪ Deviancy, so the argument runs, has its roots in generational conflict which appears along cultural lines.
▪ Doctrinaire denial of a generational injustice does no justice either to the truth or to the victims.
▪ It's a generational thing, a big deal.
▪ Many in the antiwar movement unmistakably were also waging generational civil war.
▪ To be sure, the generational shift has been gradual.
Wiktionary
generational

a. Of, pertaining to, or changing over generations.

WordNet
generational

adj. of or relating to a generation

Usage examples of "generational".

When young householders took their growing wealth and tax base with them from the cities to the suburbs, they created a economic, generational, and cultural division between them and the cities.

Even generational contemporaries, who sympathized with much CHEAP TRUTH rhetoric, came to distrust the cult itself -- simply because the Cyberpunks had become "genre gurus" themselves.

A Nike-Hercules, rising up into the Aurora Borealis, sent by a two-year-old to challenge its generational successor.

The generational clock ground out another revolution, and time turned friends to strangers.

In the early 1960s the Skunk Works built an aircraft that was a generational leap ahead of anything else in the air.

Or was she intentionally trying to stir up a generational conflict?