well-formed
Definition - That which is grammatically correct, but which might not be meaningful.

Example -

(1) Bob sent me a letter. (Well-formed and meaningful)

(2) Bob sent. (Not well-formed and not meaningful)

(3) Bob sent me stupidity.(Well-formed, but perhaps meaningless)

Oxford English Dictionary -
The term's first citation in this sense is from 1961:
"One important common problem is that of obtaining an algorithm for distinguishing sentences from nonsentences or … well-formed strings from not well-formed strings."
(A. G. Oettinger in Proc. Symposia Appl. Math. XII. 104)



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