solely
Solely (adverb) means Only, exclusively, and nothing more. Example: “This room is solely for the use of people who work in the lab.”
How to use solely
Learner’s notesIn plain EnglishUsed to stress that only one thing, person, or reason is involved, with nothing else.
Fill the gap
Can you complete this real example?
This room is _____ for the use of people who work in the lab.
Etymology
From Middle English soly, built from sole ("only, single") plus -ly.