What does "weaker" mean?

comparative form of weak: more weak

Weaker

Common synonyms include: blunted, dilute acid, dilute solvent, diluted juice, diluting agent, diminished.

/ˈwiːkə/ adj

adj ·Rare ·Advanced level

Adjective

1
comparative form of weak: more weak comparative, form-of
"Yes, there were hundreds of companies in existence, but a form of natural selection was taking place. Weaker companies were swallowed up by larger ones."
2
Said of one proposition with respect to another one: that the latter entails the former, but the former does not entail the latter.

"The yen is weaker than the dollar."