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A small campaign or test designed to gauge public response. The term originally referred to a balloon sent up to determine weather conditions: “The speech on free trade that the candidate delivered last month must have been a trial balloon; the audience reacted with hostility, and he has not mentioned the subject since.”
(also trendacious or trendoid) Following new trends in fashion, art, literature, etc; anxiously au courant: Fetch a tumbril for these fellows, or at least a trendy tailor/ A trendacious couple wear head-to-toe charcoal black/ Your trendoid older sister gives you all her hand-me-downs on the 5th (1962+)noun
(also trendoid): That will undoubtedly have great appeal to all you trendies out there/ and even a few tough trendoids from the East Village and Soho (1968+)