Nepedia
Back to Discover
Advanced Reader
📖

Assimilation (phonology)

language culture Maturity 11-13 Next article →

In the study of phonology, which is the system of sounds in a language, assimilation is a fundamental process. It occurs when one sound, called a phoneme, changes to become more similar to a nearby sound. This process can happen within a single word or between two separate words. Assimilation helps speech flow more smoothly by making the movements of the mouth more efficient. It is a common feature found in many different languages across the globe.

There are several ways to categorize how these sounds interact. One way is by looking at the distance between the sounds. Assimilation can happen between adjacent segments, which are sounds right next to each other. It can also happen between nonadjacent segments that are separated by other sounds. Another way to categorize it is by the direction of the influence. If a sound changes because of the sound that follows it, it is called anticipatory assimilation. If a sound changes to match the sound that came before it, it is called lag assimilation.

Anticipatory assimilation is the most frequent type of sound change. In this process, a sound prepares for the upcoming sound. For example, in English, the nasal sound in "handbag" may change in rapid speech. The "d" might shift to match the "b" because both are bilabial sounds. Bilabial sounds are produced using both lips. This makes the transition between the two sounds much faster.

Lag assimilation is also quite common and often follows strict linguistic rules. This happens when a sound is influenced by what was just spoken. In English, the phrase "it is" often becomes the contraction "it's." Here, the vowel is omitted, and the remaining sound becomes voiceless to match the following consonant. In Polish, the sound "s" becomes "sz" after a voiceless obstruent, which is a type of sound that blocks airflow. However, this rule does not apply across word boundaries, such as in the name Grodzisk Wielkopolski.

Sometimes, two sounds do not just become similar; they merge entirely. This process is known as coalescence or fusion. During coalescence, two adjacent sounds are replaced by a single new sound. This new sound shares characteristics from both of the original components. In the English phrase "don't you," the sounds often fuse into a "ch" sound. This is a palato-alveolar sound, meaning it is made near the roof of the mouth.

Linguists divide coalescence into two distinct types: reductive and non-reductive. Reductive coalescence occurs when the sound segments are reduced or shortened after they fuse. An example of this can be found in the Xhosa language. Non-reductive coalescence happens when the sounds do not reduce in size even after fusion. This is seen in the Shona language, where the original sounds stay present even as they fuse.

Assimilation can also be viewed through the lens of time. Synchronic assimilation refers to an active process happening in a language right now. Diachronic assimilation refers to a historical sound change that happened over many years. A famous example is the English word "cupboard." Historically, this was a compound of "cup" and "board." Over time, the pronunciation shifted so much that the original sounds are rarely used today.

These patterns are not limited to spoken words. Sign languages also exhibit assimilation. In these languages, the characteristics of neighboring cheremes, which are the units of sign language, can mix together. This shows that the drive for efficiency is a universal part of communication. Whether through voice or hand movements, languages constantly adapt to make expression easier and more fluid.

591 words

Where will your curiosity go next?

Keep exploring at your chosen reading level.

More to explore

🔬 Go deeper

More advanced topics to explore

🪜 Step back

Simpler topics to build understanding

What is Nepedia?

A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.