31 CFR § 850.216 - Knowledge.

Knowledge of a fact or circumstance (the term may be a variant, such as “know”) means:

(a) Actual knowledge that a fact or circumstance exists or is substantially certain to occur;

(b) An awareness of a high probability of a fact or circumstance's existence or future occurrence; or

(c) Reason to know of a fact or circumstance's existence.

Note 1 to § 850.216:

See the discussion of the knowledge standard in § 850.104 for more information about how this term is applied in this part.