haecceitism

Etymology
.

Noun

 * 1)  The view that entities possess haecceity (individual essences or "thisness").
 * 2) * 2005, Nathan U[cuzoglu] Salmon, Metaphysics, Mathematics, and Meaning, Oxford:, ISBN 978-0-19-928176-3, page 204:
 * The haecceity of an individual x is the property of being identical with x, i.e. the property of being that very individual. [David] Kaplan defines Haecceitism as the doctrine that
 * we can meaningfully ask whether a possible individual that exists in one possible world also exists in another without taking into account the attributes and behavior of the individuals that exist in the one world and making a comparison with the attributes and behavior of the individuals that live in the other world ... [the] doctrine that holds that it does make sense to ask – without reference to common attributes and behavior – whether this is the same individual in another possible world, that individuals can be extended in logical space (i.e., through possible worlds) in much the way we commonly regard them as being extended in physical space and time, and that a common "thisness" may underlie extreme dissimilarity or distinct thisnesses may underlie great resemblance, ...
 * The haecceity of an individual x is the property of being identical with x, i.e. the property of being that very individual. [David] Kaplan defines Haecceitism as the doctrine that
 * we can meaningfully ask whether a possible individual that exists in one possible world also exists in another without taking into account the attributes and behavior of the individuals that exist in the one world and making a comparison with the attributes and behavior of the individuals that live in the other world ... [the] doctrine that holds that it does make sense to ask – without reference to common attributes and behavior – whether this is the same individual in another possible world, that individuals can be extended in logical space (i.e., through possible worlds) in much the way we commonly regard them as being extended in physical space and time, and that a common "thisness" may underlie extreme dissimilarity or distinct thisnesses may underlie great resemblance, ...