Hundredth/ˈhʌndrədθ/ Definition 1 of 3Pro Tip 1/3Ordinal Significance Emphasizes order in a sequence, implying a milestone or a special event. The school is planning a celebration for its hundredth anniversary. Pro Tip 2/3Emotional Weight Used to express frustration or exasperation when something occurs many times. He sighed, realizing this was the hundredth time he had reminded her. Pro Tip 3/3Celebratory Tone Often combined with 'celebration' to signify a significant achievement. The town threw a parade for the hundredth year of independence.