Dictionaries
Article I, Section 9, clause 2
The Privilege of the Writ of Habeas Corpus shall not be suspended unless when in Cases of Rebellion or Invasion the public Safety may require it



A Compendious Dictionary of the English Language (1806)
(Noah Webster 1806)
when     ad. at what time, at the same time



An American Dictionary of the English Language (1828)
www.WebstersDictionary1828.com
(Noah Webster 1828)
when
WHEN, adverb [G., Latin ]

1. At the time. We were present when General LaFayette embarked at Havre for New York.

2. At what time, interrogatively.

WHEN shall these things be? Matthew 24:3.

3. Which time.

I was adopted heir by his consent; since when his oath is broke.

4. After the time that. when the act is passed, the public will be satisfied.

5. At what time.

Kings may take their advantage, when and how they list.

WHEN as, at the time when; what time.

WHEN as sacred light began to dawn.


Merriam-Webster Dictionary (Online)
(Merriam-Webster 2024)