Related Term(s):

• determiner
• empty word
• form word
• function word
• grammatical word
• preposition
• structure word

Synonym(s):

• functional marker
• functional morpheme
• functor
• grammatical item
• relator

Source(s):

PEI & GAYNOR 195479 (functional word)
MARTINET 196245 (= functional indicator)
ELL5165

• PEI, Mario A. & GAYNOR, Frank. (1954) A Dictionary of Linguistics. New York : Philosophical Library.
• MARTINET, André. (1962) A Functional View of Language. Oxford: Oxford University Press.
• The Encyclopedia of Language & Linguistics. (1994) Oxford: Pergamon Press.