Final answer:
Accession is when improvements become part of another's property, and can lead to legal implications regarding ownership and potential compensation.
Step-by-step explanation:
A situation where someone adds fixtures or improvements to your property in a way that they become part of it can be described using the concept of 'accession.' In legal terms, accession occurs when improvements are made to personal property, subsequently integrating them with other properties in such a manner that they cannot be separated without causing damage. These improvements, whether intentional or unintentional, now become part of the original property, potentially creating legal implications for ownership and compensation.
For instance, if a neighbor builds a fence that erroneously extends onto your land and becomes an integral part of the land, those improvements have legally acceded to your property. In some jurisdictions, the person who made the improvements may seek compensation under certain circumstances, if done in good faith. It's a complex situation that often requires litigation to resolve property disputes arising from such actions.