A lot vs. Alot: 9 Grammatical Pitfalls
"piece of ground," 1510s, from plot (q.v.), assimilated to Middle English adjective plat "flat," which is from Old French plat "flat, stretched out" (see plateau (n.)). See OED for full explanation.
"to interweave," late 14c., variant of plait (v.). Related: Platted; platting.