In grammar, a particle is a function word that does not belong
to any of the inflected grammatical word classes (such as nouns,
pronouns, verbs, or articles). It is a catch-all term for a
heterogeneous set of words and terms that lack a precise lexical
definition. It is mostly used for words that help to encode
grammatical categories (such as negation, mood or case), clitics
or fillers or discourse markers that facilitate discourse such
as well, ah, anyway, etc. Particles are uninflected.1 As
examples, the English infinitive marker to and negator not are
usually considered particles. Depending on its context, the
meaning of the term may overlap with such notions as "morpheme",
"marker", or even "adverb" as in phrasal verbs such as out as in
get out. Under the strictest definition, which demands that a
particle be an uninflected word, English deictics like this and
that would not be classed as such (since they have plurals) and
are therefore inflected, and neither would Romance articles
(since they are inflect