Incident to can be replaced by a number of synonyms, depending on the context in which the phrase is used. Some of the possible synonyms include related to, connected with, associated with, linked to, integral to, inherent in, essential to, dependent upon, subordinate to, auxiliary to, and supplementary to. Each of these synonyms highlights a slightly different aspect of the relationship between two things or events. Some emphasize the idea of something being necessary or essential to another thing, while others emphasize the idea of something being connected or related in some way. Ultimately, the choice of synonym will depend on the specific context of the situation.