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Either

Either is a versatile English word used to signal a choice between two options. It can function as a determiner, a pronoun, a coordinating conjunction, and an adverb in negative clauses. In all uses, it refers to one of two possibilities and not to three or more. The word is neutral and non-committal, often used when a speaker wants to defer a decision or present alternatives.

As a determiner, either modifies a noun to denote one of two possibilities: take either road, choose

As a coordinating conjunction, either appears in the correlative phrase either … or … to join two alternatives:

As an adverb, either is used in negative contexts to mean “also not” or “neither”: I don’t

Etymology traces back to Old English ǣġer, meaning “one or the other of two,” and it has

either
option.
As
a
pronoun,
it
can
stand
for
one
of
two
mentioned
items:
I
don’t
want
to
decide
now;
I’ll
take
either.
It
can
also
appear
with
of
to
refer
specifically
to
two
items:
I’ll
take
either
of
the
two
options.
You
can
have
either
coffee
or
tea.
In
such
constructions,
the
verb
often
agrees
with
the
noun
closest
to
it
when
the
subject
is
compound.
like
it
either.
This
usage
is
commonly
paired
with
the
negative
form
of
a
verb,
and
it
contrasts
with
the
affirmative
alternative
in
the
discourse.
The
phrase
either
way
is
used
to
indicate
that
a
choice
can
be
made
in
one
of
two
possible
directions.
cognates
in
other
Germanic
languages.