The definition of each is every one in the group.
(adjective)An example of each used as an adjective is in the phrase "each student in the class," which means every single student in the class.
Each means every person in a group.
(pronoun)An example of each used as a pronoun is in the sentence, "Each received a packet," which means that every person received a packet.
Each is defined as for every one.
(adverb)An example of each used as an adverb is in the phrase "a slice of pizza each," which means that every one received one slice of pizza.
See each in Webster's New World College Dictionary
adjective, pronoun
Origin: ME ech, elc, each, every < OE ælc < *agilic, akin to OHG iogilith (Ger jeglich) < PGmc *aiw-galic: see aye & alike
adverb
See each in American Heritage Dictionary 4
adjective
Origin:
Origin: Middle English ech
Origin: , from Old English ǣlc; see līk- in Indo-European roots
. Usage Note: The traditional rule holds that the subject of a sentence beginning with each is grammatically singular, and the verb and following pronouns must be singular accordingly: Each of the apartments has (not have) its (not their) own private entrance (not entrances). When each follows a plural subject, however, the verb and subsequent pronouns remain in the plural: The apartments each have their own private entrances (not has its own private entrance). But when each follows the verb with we as its subject, the rule has an exception. One may say either We boys have each our own room or We boys have each his own room, though the latter form may strike readers as stilted. • The expression each and every is likewise followed by a singular verb and, at least in formal style, by a singular pronoun: Each and every driver knows (not know) what his or her (not their) job is to be. See Usage Notes at every, they.Learn more about each