parsimony (n.) Look up parsimony at Dictionary.com
early 15c., from Latin parsimonia "sparingness, frugality, thrift," from pars-, past participle stem of parsi, perfect tense of parcere "to spare, save, refrain from, use moderately" (which is said to be unrelated to Latin parvus "small," parum "too little") + -monia, suffix signifying action, state, or condition.