Etymology
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lariat (n.)
rope or cord used for tying or catching horses, 1832, American English, from Spanish la reata "the rope," from reatar "to tie against," from re- "back" (see re-) + atar "to tie," from Latin aptare "to join," from aptus "fitted" (see apt). Compare lasso.
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riata (n.)

"lariat," 1846, from Spanish reata (see lariat).

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lasso (n.)
"long rope with a running noose," used for catching horses and cattle, 1808, earlier laço (1768), American English, from Spanish lazo "a snare, slipknot," from Latin laqueum (nominative laqueus) "noose, snare" (see lace (n.)). As a verb from 1807. Related: Lassoed; lassoing. A lasso can serve as a lariat, but the reverse is not true.
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