Choose the odd one out: Tricycle, Trident, Trifle, Tricolour

Concept: In a word classification / "odd one out" question, group the given words by their real underlying meaning (not merely by shared letters or a shared starting sound) and find the one word whose meaning does not fit that shared group.

Application: Three of the four words here are genuinely built from the prefix "tri-", meaning "three":

• Tricycle = "tri-" (three) + "cycle" (wheel) → a vehicle with three wheels.

• Trident = "tri-" (three) + a term for a prong/tooth → a three-pronged spear.

• Tricolour = "tri-" (three) + "colour" → something with three colours (e.g. a flag).

• Trifle is a chilled, layered dessert; although its spelling happens to start with the letters t-r-i, the word does not come from the "tri-" (three) prefix at all — it derives from an Old French term meaning something of little value.

Cross-check: Only one of the four words fails to carry the "three" meaning even though its spelling coincidentally starts with "tri" — so that word does not belong with the other three.

Hence "Trifle" is the odd one out.