Pelosi "dissolved" both Houses, called the House to order, then walked out.
There is no mention of "dissolve" in the Congressional Glossary of terms. https://www.congress.gov/help/legislative-glossary#d
I searched Congressional Record archives for “dissolved” - it seemed to be commonly used when ending joint “sessions” or joint “meetings” of House and Senate.
Congressional meetings get adjourned, not dissolved.
In parliamentary and some semi-presidential systems, a dissolution of parliament is the dispersal of a legislature at the call of an election. Parliaments get “dissolved.”
She’s been in Congress long enough to know that. Was that more senility showing through?