IPA: /nɒnˈjuːnɪk/
KK: /nɑnˈjunɪk/
The condition where something is not unique or does not have a single distinct form or value.
The nonuniqueness of the solutions made it difficult to determine the best option.
Nonuniqueness → It is formed from "non-" (meaning not) and "uniqueness" (from Latin "unicus", meaning single or unique, combined with the suffix "-ness", which denotes a state or quality). The word refers to the state of not being unique or singular.
Think of 'not' ('non-') and 'single' ('unicus') to remember that 'nonuniqueness' means the state of not being unique.