Meaning : Any material used to thicken.
Example :
Starch is used in cooking as a thickening.
Synonyms : thickener
Meaning : The act of thickening.
Synonyms : inspissation
Meaning : Accumulating and becoming more intense.
Example :
The deepening gloom.
Felt a deepening love.
The thickening dusk.
Synonyms : deepening
Meaning : Becoming more intricate or complex.
Example :
A thickening plot.