effective
UK: ɪˈfɛktɪv | US: ɪˈfɛktɪv
adj. producing a desired or intended result
adj. operative or in force
adj. impressive or striking in appearance
The word "effective" originates from the Latin effectivus, meaning "productive" or "capable of accomplishing." It combines effect (from Latin effectus, past participle of efficere "to bring about") and the suffix -ive, which forms adjectives indicating a tendency or capacity. The term evolved through Old French (effectif) before entering Middle English, retaining its core meaning of "producing results." The logical progression highlights how "effect" (result) + "-ive" (ability) merges to describe something that successfully achieves its purpose.
The new policy proved highly effective in reducing waste.
She gave an effective presentation that convinced the investors.
The law will become effective next month.
His speech was short but remarkably effective.
The medicine is effective against most strains of the virus.