1. plural of ninetieth; the ordinal number corresponding to the number ninety in a sequence
2. plural of ninetieth; each of ninety equal parts of something

1. plural form of ninetieth when used as an adjective

Examples

• The ninetieths on the list were the last to be called.
• She finished in the ninetieths percentile on the exam.
• The recipe calls for measuring ingredients to the ninetieths of a cup.
• Both contestants placed in the ninetieths during the competition.
• The ninetieths anniversary celebrations were planned for next year.
• He divided the inheritance into ninetieths for all the beneficiaries.