syntagm

Concise Oxford English Dictionary © 2008 Oxford University Press:
syntagm /ˈsɪntam/ (also syntagma /sɪnˈtagmə/)

▶noun (pl. syntagms, syntagmas, or syntagmata /-mətə/) Linguistics a set of forms in a sequential relationship. Often contrasted with paradigm.

– derivatives
syntagmatic /ˌsɪntagˈmatɪk/ adjective,
syntagmatically adverb,
syntagmatics plural noun.

– origin C17: via late L. from Gk suntagma, from suntassein ‘arrange together’.