ACS · Dictionary Entry
How to cite a dictionary entry in ACS
A dictionary-entry citation credits one definition in a reference work, print or online. The classic mistakes are opening a thesis chapter with a dictionary definition where a field definition is expected, and citing an aggregator site instead of the dictionary it scraped.
Worked example · ACS
(1) Lovelace, A. Epistemology. Example English Dictionary; Example University Press, 2025.
Rendered with the official ACS style file from a placeholder source (reserved example DOI and domain), so the format is exactly what the style produces. In text: This generator renders the numeric variant, with references numbered in citation order.
What to collect before you cite a dictionary entry
- The headword you are citing
- The dictionary title and edition
- The publisher
- Year, or the access date for continuously updated online editions
- The URL for online dictionaries
Have a DOI? Generate the reference instantly
Journal articles, many books and reports carry a DOI. Paste it and get the ACS entry from the same engine that produced the example above.
Citing a whole thesis, not one source?
CiteDash keeps your bibliography in ACS automatically, verifies every citation against a real paper, and compiles to DOCX, PDF or LaTeX.
Citing a dictionary entry in ACS: FAQ
Is defining a term with a dictionary good practice in a thesis?
Usually not for your core concepts: examiners expect field definitions from the literature. A dictionary citation fits when ordinary language itself is the point, such as etymology or contested usage.
Online dictionaries change. Which date do I use?
Use the access date for continuously updated editions, and the edition year for fixed ones. The point is that a reader can reconstruct what you saw.
The entry has no author. What goes first?
The headword or the dictionary title, depending on the style. Unsigned reference-work entries never get an invented author.
What does the in-text citation look like in ACS?
This generator renders the numeric variant, with references numbered in citation order.
Is the example on this page hand-written?
No. It is rendered by the same citation engine and official CSL style file CiteDash uses for full thesis bibliographies, from a clearly-marked placeholder source, and a test re-renders it on every release so the page can never drift from the engine.