n. 1. a. Growth or increase in size by gradual external addition, fusion, or inclusion. b. Something added externally to promote such growth or increase.
Now it seemed to Marta that she was filled with a vapor, such a smoke as folk have in their steadings toward the end of winter, that is the accretion of all the fires that have been made over the winter, and all the food that has been cooked, and all the breaths that have been taken.– Jane Smiley, The Greenlanders
I saw this word at work this week and fell in love with it, and then it appeared in my book today.