Synonym: 9th, one-ninth. Similar words: pain in the neck, man in the street, skeleton in the cupboard, fly in the ointment, a fly in the ointment, in the way, plinth, in the red. Meaning: [naɪnθ] 
n. 1. position nine in a countable series of things 2. one part in nine equal parts. adj. coming next after the eighth and just before the tenth in position.
n. 1. position nine in a countable series of things 2. one part in nine equal parts. adj. coming next after the eighth and just before the tenth in position. 
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211. And so is this point from Arne Duncan, the secretary of education: "Currently about one-fourth of ninth graders fail to graduate high school within four years.
More similar words: pain in the neck, man in the street, skeleton in the cupboard, fly in the ointment, a fly in the ointment, in the way, plinth, in the red, in that, run into, in theory, in the end, absinthe, in the air, turn into, in the way of, in that way, in the main, in the past, in the open, hyacinth, in the dark, in this case, in the world, in the least, up in the air, in the front, in the lurch, in the black, labyrinth.