What does bidirectionally mean?
Bidirectionally is an adverb describing something that operates, moves, or flows in two opposite directions. It is formed from 'bidirectional,' which combines the Latin-derived prefix 'bi-,' meaning 'two,' with 'directional,' relating to direction. The word is most common in technical and scientific writing: engineers describe data traveling bidirectionally across a network link, biologists note that signals pass bidirectionally between cells, and software documentation may specify that records sync bidirectionally between two systems. Beyond technology, it can characterize mutual relationships, as when influence runs bidirectionally between teacher and student. Because it is precise and slightly formal, it appears rarely in casual speech, where people usually say 'both ways' instead. Its usefulness lies in condensing an entire clause into one word: saying something moves bidirectionally instantly tells the reader there are two channels of movement or exchange, each operating in the opposite direction of the other.
adverbIn a way that operates, moves, or functions in two opposite directions; capable of acting or flowing both ways between two points.
- (of communication, data transfer, or exchange) in both directions between two parties or endpoints.
- (of movement, flow, or operation) capable of proceeding along two opposite paths or orientations.
- (of relationships or influence) exerting effect mutually, each side influencing the other.
"The two departments communicate bidirectionally, sharing data and feedback in equal measure."
"The API supports bidirectionally synchronized calendars across all devices."
"The relationship works bidirectionally: the mentor learns from the student as much as the other way around."
Every time you video-chat with someone across the world, you're relying on data that travels bidirectionally — and the prefix 'bi-' doing the heavy lifting is over 2,000 years old.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bidirectionally
Bidirectionally derives from 'bidirectional,' a modern English formation combining the Latin prefix 'bi-' ('two') with 'directional,' itself rooted in the Latin verb 'dirigere' ('to set straight, direct'). The compound follows a productive English pattern for forming adverbs by adding '-ally' to adjectives ending in '-al.' Its cognates include other 'bi-' formations borrowed or modeled on Latin, such as 'bilateral' and 'bicameral.' The word arose in modern technical English, gaining currency alongside twentieth-century developments in electronics, computing, and communications where two-way transmission needed a precise term.
Related word forms
How bidirectionally is actually used
Bidirectionally is a technical-sounding adverb most at home in formal, scientific, engineering, and computing contexts — networking documents, neuroscience papers, API specifications. In everyday conversation, speakers typically prefer phrases like 'both ways' or 'in both directions.' It carries a neutral, precise connotation rather than any emotional coloring.
Easily confused with bidirectionally
Bilingual refers to using or speaking two languages, while bidirectionally describes movement or operation in two directions.
Ambidextrously means equally well with either hand, whereas bidirectionally concerns two-directional flow rather than handedness.