“…For example, in the sentence A canner can can a can, the first can is a modal verb which means "be able to", the second can is a verb which means "to preserve food by putting it in a can", the last can is a noun which means "a metal container". Linguists call this class cleavage (Bloomfield, 1933), multiple class membership (Bloomfield, 1933;Allerton, 1979;Biber, 1999;Hudson & Hudson, 2007;Jackson & Amvela, 2007;Jackson, 1988;Nida, 1948), multifunctionality (Harris, 1946;Braun, 2009), decategorization (Hopper & Thompson, 1984), intercategorial polysemy (Zawada, 2005), zeroderivation (Kastovsky, 2005), transcategorization (Halliday & Matthiessen, 2006), heterosemy (Enfield, 2006), conversion (Balteiro, 2007), word class expansion (Fan & Altmann, 2008) and polyfunctionality (Wang, 2016). In this paper, we follow the terminology from Wang (2016): words that have more than one part of speech are called polyfunctional words, while words with only one part of speech are called monofunctional words; the number of parts of speech they have is referred to as polyfunctionality (PF).…”