instantaneously
UK: ˌɪnstənˈteɪniəsli | US: ˌɪnstənˈteɪniəsli
adv. happening or done immediately, without any delay
The word "instantaneously" derives from the Latin instantaneus, meaning "immediate," which itself comes from instans (present participle of instare, "to urge or stand upon"). The suffix -aneous (from Latin -aneus) forms adjectives, while -ly converts it into an adverb. The morphemes logically combine to emphasize immediacy in action, preserving the original Latin sense of urgency.
The system responds instantaneously to user input.
Light travels instantaneously in a vacuum.
Her expression changed instantaneously when she heard the news.
The app updates data instantaneously across all devices.
The chemical reaction occurs almost instantaneously under these conditions.