1. In Linguistics:
* A digraph is a pair of letters that represent a single sound.
* Examples in English include "sh" (as in "ship"), "ch" (as in "chair"), "th" (as in "thin"), and "ph" (as in "phone").
* Digraphs can be made up of two vowels ("ea" in "read") or two consonants ("ck" in "duck").
2. In Graph Theory:
* A digraph (short for directed graph) is a type of graph where the edges have a direction.
* This means that the relationship between two nodes is not symmetrical.
* For example, a digraph could represent a one-way street network, where a road going from A to B is different from a road going from B to A.
To understand which meaning is intended, you need to consider the context. For example, "The digraph 'th' represents the 'th' sound" is clearly referring to the linguistic definition. On the other hand, "The digraph shows the flow of traffic in the city" would likely refer to the graph theory definition.