Q1 noun3 •The first quarter of a calendar year (January, February and March).“Now, let’s consider what our competition did in the same six-week period,” wrote Betsy Ankney, Haley’s campaign manager. “Donald Trump had a good Q1, if you count being indicted as ‘good.'" — 2023 •The first quarter of a financial year. •The first quartile. formsQ1s