Semantics is a term that refers to how meaning is assigned in language. A domain is essentially a specific place or territory. A semantic domain is a specific place that shares a set of meanings, or a language that holds its meaning, within the given context of the place. Harriet Ottenheimer (2006), a writer in Linguistic Anthropology, defines a semantic domain as a “specific area of cultural emphasis”.
In lexicography a semantic domain is defined as "an area of meaning and the words used to talk about it ... For instance English has a domain ‘Rain’, which includes words such as rain, drizzle, downpour, raindrop, puddle.". Semantic domains are the foundational concept for initial stages of vernacular dictionary building projects. This uses techniques such as the Dictionary Development Process (DDP), RapidWords, or software such as WeSay or FLEx. These techniques rely on extensive lists of semantic domains that are relevant to vernacular languages.
In the social sciences, the concept of semantic domains stemmed from the ideas of cognitive anthropology. The quest was originally to see how the words that groups of humans use to describe certain things are relative to the underlying perceptions and meanings that those groups share (Ottenheimer, 2006, p. 18). Ethnosemantics became the field that concentrated around the study of these semantic domains, and more specifically the study of how categorization and context of words and groups of words reflected the ways that different cultures categorize words into speech and assign meaning to their language.
Many sports have specific semantic domains that entail terminology that is specific to that particular sport. In order to understand the meanings of these terms one would need to understand the context and domain of that sport. For instance, in basketball there are many words that are specific to the sport. Free throw, court, half court, three pointer, and point guard are all terms that are specific to the sport of basketball. These words make very little sense when used outside of the semantic domain of basketball.
Another example of a semantic domain would be a coffee shop. The words latte, cappucino, or Starbucks probably would not be understood unless one could associate this language with the semantic domain of a coffee shop.
Other Articles and Research Related to Semantic Domains
Gugeon, J.A., Linde, C., (1980). "On The Independence of Discourse Structure and Semantic Domain". Association for Computational Linguistics Proceedings, 18th Annual Meeting, 35-37. OCLC 702403374
Rusch, C.D., (2004). Cross-cultural variability of the semantic domain of emotion terms : an examination of English shame and embarrass with Japanese hazukashii. Cross-cultural research. Link
Wilbur, R.B., (1999). The Semantic Domain of Classifiers in American Sign Language. Language and Speech, v42 n2-3 p229-50. 
- Oxford English Dictionary. Oxford (UK): Oxford University Press. 1989.
- Ottenheimer, Harriet J. (2006). The Anthropology of Language: an introduction to linguistic anthropology. Belmont (Canada): Wadsworth. p. 18. ISBN 9780534594367.
- Moe, Ronald. "What is a semantic domain?". Semantic Domains. Retrieved 12 July 2014.
- Moe, Ronald (2003). "Compiling Dictionaries Using Semantic Domains". Lexikos 13: 215–223.
- Moe, Ronald (2007). "Dictionary Developmemt Program". SIL Forum for Language Fieldwork.
- Albright, Eric; Hatton, John (2007). "WeSay: A Tool for Engaging Native Speakers in Dictionary Building". Documenting and Revitalizing Austronesian Languages: 189–201.
- "List of Semantic Domains". SIL International. Retrieved 12 July 2014.
- "Semantic Domains for vocabulary of Australian languages". Australian National University. Retrieved 12 July 2014.