What does molecularly mean?
Molecularly means in relation to molecules or at the level of individual molecules. It is used when a property, difference, interaction, or process is best described in terms of molecular structure or behaviour. For example, two substances may look similar in ordinary use yet be molecularly distinct because their atoms are arranged differently or because they contain different chemical groups. The adverb is also common in technical discussions of bonding, modification, engineering, and recognition. It belongs mainly to scientific and formal registers, including chemistry, biology, medicine, and materials science. In less specialized writing, the expression 'at the molecular level' can often convey the same idea more directly. Although molecularly is formally an adverb, it may occasionally appear in phrases where 'molecular' would be more conventional, especially in compound constructions such as 'molecularly bonded'.
adverbIn a way that relates to molecules or occurs at the level of individual molecules.
- In relation to molecules; at the level of individual molecules.
"The two formulations are molecularly distinct, despite having similar effects in the laboratory."
"The researchers designed a scaffold that holds the cells together molecularly."
"The compounds are chemically different but molecularly similar in size and structure."
Molecularly zooms past the everyday scale to reveal the tiny molecular arrangements responsible for a material's behaviour.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does molecularly come from?
The word ultimately comes from Latin moles, meaning 'a mass' or 'bulk', through the diminutive molecula, meaning 'a small mass'. English acquired molecule in the seventeenth century, and molecular was formed from it during the following centuries. Molecularly combines the adjective molecular with the adverb-forming suffix -ly, expressing action or qualification at the molecular level.
Related word forms
How molecularly is actually used
This is a formal technical adverb, used chiefly in chemistry, biology, medicine, and materials science. It is less common in everyday speech, where a simpler phrase such as 'at the molecular level' may be clearer.