Synonym: 80th. Similar words: weighting, lightweight, fortieth, sixtieth, fiftieth, thirtieth, twentieth, ninetieth. Meaning: ['eɪtiɪθ] 
n. position 80 in a countable series of things. adj. the ordinal number of eighty in counting order.
n. position 80 in a countable series of things. adj. the ordinal number of eighty in counting order. 
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1. All our family came to Grandad's eightieth birthday party.
2. Mr Stevens recently cele-brated his eightieth birthday.
3. All our family came to our grandfather's eightieth birthday party.
4. Mrs Selman celebrated her eightieth birthday just last week.
5. We are going to celebrate our granduncle's eightieth birthday.
6. Nano - particle size is only one eightieth of the hair, also known as Advanced Micro Devices particles.
7. The stamps have been issued to mark the eightieth anniversary of Russia's counter - intelligence service.
8. Poor man, he died in 1989, just short of his eightieth birthday.
More similar words: weighting, lightweight, fortieth, sixtieth, fiftieth, thirtieth, twentieth, ninetieth, seventieth, multiethnic, lighting, fighting, mightily, sighting, high time, nightingale, eight, moonlighting, weight, eighth, height, eighty, take delight in, heights, sleight, weighty, freight, eighteen, weighted, heighten.