Subjectivity (noun)

1. The quality of being based on or influenced by personal feelings, tastes, or opinions.
2. The quality of being dependent on the perspective of the individual observer or experiencer.

Origin:

Late 18th century: from french subjectivité, or modern latin subjectivitas, from subjectus (see subject).

Examples:

1. The subjectivity of taste was hotly debated among the art critics.
2. The subjectivity of memory can make it difficult to trust eyewitness testimony.
3. The subjectivity of beauty is a never-ending source of argument.
4. The subjectivity of history can make it challenging to write an objective account.
5. The subjectivity of his writing made it difficult to determine his true intentions.