意 is a bound form (b.f.) that rarely appears alone; it serves as a building block in many common compounds. Its core meanings span 'meaning, idea, intention' (in 意思, 意见), 'attention, suggestion, hint' (in 注意, 建议), and the verbal sense of 'to think, expect, regard' (in 意料, 意外). It also functions as an abbreviation for Italy in words like 意大利 and 意文. Context from the surrounding characters is essential to pick the right sense.