Material.

Material. The term material, when used to qualify a requirement for the furnishing of information as to any subject, limits the information required to those matters about which an average prudent investor ought reasonably to be informed.
The termmaterial,when used to qualify a requirement for the furnishing of information as to any subject, limits the information required to those matters about which an average prudent investor ought reasonably to be informed.

Source

17 CFR § 210.1-02

Scoping language

Unless the context otherwise requires, terms defined in the general rules and regulations or in the instructions to the applicable form, when used in Regulation S-X (this part 210), shall have the respective meanings given in such instructions or rules. In addition, the following terms shall have the meanings indicated in this section unless the context otherwise requires.