What does instillation mean?
Instillation is a formal noun meaning the act of introducing a liquid into a body or container, usually in small drops. In medical contexts, it can refer specifically to administering eye drops, ear drops, or another liquid treatment. The word also has a figurative sense: the gradual implantation of an idea, belief, or attitude in a person, as in the instillation of confidence or discipline. Its careful, somewhat technical tone makes it especially common in medicine and formal education, though it can be used in literary contexts to emphasize a slow and deliberate influence. The term derives from a Latin expression meaning “to drop in,” which reflects the original practice of introducing liquid drop by drop.
The act or process of introducing a liquid into a body or container, especially in small drops.
"The treatment involved the instillation of several drops into the affected eye."
This is the standard medical and technical sense.
The gradual implantation or inculcation of an idea, belief, principle, or attitude in someone's mind.
"His teaching was marked by the steady instillation of curiosity in his students."
This figurative sense is formal and is especially associated with education, upbringing, and the transmission of values.
The plural is uncommon but is used for separate acts or instances of instillation, especially in medical or scientific writing.
"The daily instillations were recorded on the patient's chart."
Instillation comes from the Latin word for “to drop in,” preserving the image of liquid entering one small drop at a time.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does instillation come from?
Instillation comes from the Latin verb instillare, formed from in- (“into”) and stillare (“to drop”), so its earliest sense was “to drop into” or “to pour in.” English adopted the word for both the physical process of introducing liquid and, later, the figurative process of implanting an idea in the mind. It is closely related to instil and instill, as well as to distill and distillation, which share the same Latin root associated with dripping or dropping.
Related word forms
How instillation is actually used
In medicine, it is a formal term commonly used for administering liquid medication in drops, particularly into the eye or ear. Its figurative use is formal and often conveys the deliberate, gradual transmission of knowledge or values.
Easily confused with instillation
Instillation is the introduction of liquid or an idea, whereas installation is the process of setting up equipment or placing someone in a position.
Instillation usually involves adding liquid in drops or small amounts, while infusion generally involves introducing a liquid more continuously, as with a tea or intravenous infusion.