"pertaining to the system of weights and measures based on the meter," 1855, from French métrique, from mèter (see meter (n.2)). In this sense, metrical is attested from 1797. Metric system is attested by 1855.
"act of changing forms or qualities," c. 1600, noun of action from Medieval Latin diversificare "to diversify" (see diversify). Economic sense, in reference to the spread of production over a variety of services or articles, is attested from 1939, later of the spread of investments over a variety of enterprises.
former transliteration of the name of the Chinese capital city, now (in the pinyin system) called Beijing. In the Wade-Giles system it was Peiping; the form Peking pre-dates Wade-Giles and was formed by the old British-run, Hong Kong-based Chinese postal system. Peking duck, "large domestic duck of white plumage and orange beak and legs," is attested from 1880.