Of or relating to accrementation; concerning growth or accumulation through addition of material.
From Latin 'accretio' (growth, increase) combined with '-al' and '-itial' suffixes, used in geology and biology to describe processes of gradual accumulation or buildup of material.
This is a supremely technical word found almost exclusively in geology textbooks—it describes how mountains grow grain by grain, coral reefs polyp by polyp, showing how 'accremental' change can build mountains.
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