concomitantly

Concomitantly is an adverb meaning existing or occurring at the same time as something else; accompanying or associated in a parallel manner. The form derives from the adjective concomitant, which comes from Latin concomitans, formed from con- “together” and comitari “to accompany.” The suffix -ly creates the adverb.

Usage is most common in medical, pharmacological, and scientific writing, where it signals that two events, conditions, or treatments occur simultaneously or are related as coexisting factors. It can modify verbs, as in “the therapy was administered concomitantly with surgery,” and it is often used to emphasize accompaniment rather than sequence. It is somewhat more formal and specialized than synonyms such as simultaneously or concurrently, and it can convey a sense of a linked or accompanying state.

Examples illustrate its typical sense: “Concomitantly with the initiation of treatment, the patient’s symptoms improved.” “The study observed concomitant changes in biomarker levels.” In other contexts, such as philosophy or law, it may describe phenomena that occur together as part of a broader pattern rather than in a temporal sequence.

Notes and related terms: concomitant (adj or noun) and concomitance (noun) are closely related. Concomitantly should be reserved for formal or technical writing where precise co-occurrence or accompaniment is being conveyed; in everyday language, alternatives like simultaneously or concurrently are often clearer.