Full Idea
Not all explanations are causal. We can explain some things by showing what follows logically from what, or what is required by the definition of a term, or in terms of purpose.
Gist of Idea
In addition to causal explanations, they can also be inferential, or definitional, or purposive
Source
Robin Le Poidevin (Travels in Four Dimensions [2003], 05 'Limits')
Book Reference
Le Poidevin,Robin: 'Travels in Four Dimensions' [OUP 2003], p.78
A Reaction
Would these fully qualify as 'explanations'? You don't explain the sea by saying that 'wet' is part of its definition.