The word "is" represents a singular form of the word be.(verb)
An example of is can be saying that someone currently has employment as a salesperson.
See is in Webster's New World College Dictionary
Origin: ME < OE, akin to Ger ist < IE *esti (> Sans àsti, Gr esti, L est) < base *es-, to be + -ti, prob. orig. an enclitic pron.
See is in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old English; see es- in Indo-European roots.
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