expressing location or arrival in a particular place or position

they live at Conway House

they stopped at a small trattoria

expressing the time when an event takes place

the children go to bed at nine o'clock

his death came at a time when the movement was split

denoting a particular point or level on a scale

prices start at £18,500

driving at 50 mph

expressing a particular state or condition

his ready smile put her at ease

they were at a disadvantage

expressing the object of a look, thought, action, or plan

I looked at my watch

Leslie pointed at him

policies aimed at reducing taxation

expressing the means by which something is done

holding a prison officer at knifepoint

her pride had taken a beating at his hands

(in an online discussion, especially on Twitter) address (someone) in order to draw their attention to a comment or post, by using an @ symbol preceding their name

I see they've atted me demanding I follow back.

a monetary unit of Laos, equal to one hundredth of a kip

the chemical element of atomic number 85, a radioactive member of the halogen group. Astatine was first produced by bombarding bismuth with alpha particles, and it occurs in traces in nature as a decay product

the chemical element astatine