A suffix is a style at the end of a person's name which gives additional identifying information about the person. These may be academic, professional, honorary or social.
In the United States, callsigns for broadcast stations may have a suffix of -FM, -AM, -TV, -LP, or -CA, if the root callsign is the same as another station's. The -HD and -DT suffixes for digital television have been dropped.
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It comes from the Greek nounsuffix -ismos and means roughly the act, state, or theory of. Nouns that end in -ism often have related verbs that end in -ize (criticism/criticize), related agent nouns that end in -ist (optimism/optimist), and related adjectives that end in -istic (optimistic).
The suffix -ist, which comes from the Greek suffix -istes, forms agent nouns, that is, nouns that denote someone who does something.
The suffix -less comes from the Old English suffix -leas, from the word leas, meaning without. In Old English and Middle English, -less was often used to convey the negative or opposite of words ending in -ful, as in careful/careless and fearful/fearless.