Longman Dictionary of Contemporary English
focus group
noun
EXAMPLES FROM CORPUS
▪ He is a very mundane politician reading the focus group results and staking out a position he thinks will sell.
▪ Many of their positions and campaign strategies seem designed primarily to satisfy this or that focus group.
Wiktionary
focus group
n. A group of people, sampled from a larger population, interviewed in open session for market research or political analysis
Wikipedia
Focus group
A focus group is a form of qualitative research in which a group of people are asked about their perceptions, opinions, beliefs, and attitudes towards a product, service, concept, advertisement, idea, or packaging. Questions are asked in an interactive group setting where participants are free to talk with other group members. During this process, the researcher either takes notes or records the vital points he or she is getting from the group. Care should be noted to select members of the group carefully for effective and authoritative responses.