concrescence

noun

1. (countable, uncountable)The growing together and merging of similar or dissimilar parts.
2. (countable, uncountable)A growing together of cells or other organisms.
3. (countable, uncountable)The juxtaposing of dissimilar forms or devices that are harmonized at their point of intersection into hybrid transitional shapes or designs.
4. (countable, uncountable)Increment.