Introduce the term "lexeme"

[ruv]

One example where using the term "lexeme" makes the wording much clearer is in the section 8.3.1:

• When the text interpreter processes a number a lexeme, except a <cnum>, that is immediately followed by a decimal point and is not found as a definition name, the text interpreter shall convert it to a double-cell number.

(See also the source issue)

Update. This can be formulated even better:

• When the text interpreter processes a number a lexeme , except a <cnum>, that is immediately followed by that ends with a decimal point and is not found as a definition name, the text interpreter shall convert it to a double-cell number.

[SirWumpus]

In a new issue you should probably also suggest adding a secondary example concerning double-cell input to make more clear some of the expected behaviour.