Dictionary.net

a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium

a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium

Primarily, this word expresses the relations of presence, nearness in place or time, or direction toward; as, at the ninth hour; at the house; to aim at a mark. It is less definite than in or on; at the house may be in or near the house. From this original import are derived all the various uses of at.

A relation of proximity to, or of presence in or on, something; as, at the door; at your shop; at home; at school; at hand; at sea and on land.

The relation of some state or condition; as, at war; at peace; at ease; at your service; at fault; at liberty; at risk; at disadvantage.

The relation of some employment or action; occupied with; as, at engraving; at husbandry; at play; at work; at meat (eating); except at puns.

The relation of a point or position in a series, or of degree, rate, or value; as, with the thermometer at 80¡; goods sold at a cheap price; a country estimated at 10,000 square miles; life is short at the longest.

The relations of time, age, or order; as, at ten o'clock; at twenty-one; at once; at first.

The relations of source, occasion, reason, consequence, or effect; as, at the sight; at this news; merry at anything; at this declaration; at his command; to demand, require, receive, deserve, endure at your hands.

Relation of direction toward an object or end; as, look at it; to point at one; to aim at a mark; to throw, strike, shoot, wink, mock, laugh at any one.

Primarily, this word expresses the relations of presence, nearness in place or time, or direction toward; as, at the ninth hour; at the house; to aim at a mark. It is less definite than in or on; at the house may be in or near the house. From this original import are derived all the various uses of at.

A relation of proximity to, or of presence in or on, something; as, at the door; at your shop; at home; at school; at hand; at sea and on land.

The relation of some state or condition; as, at war; at peace; at ease; at your service; at fault; at liberty; at risk; at disadvantage.

The relation of some employment or action; occupied with; as, at engraving; at husbandry; at play; at work; at meat (eating); except at puns.

The relation of a point or position in a series, or of degree, rate, or value; as, with the thermometer at 80¡; goods sold at a cheap price; a country estimated at 10,000 square miles; life is short at the longest.

The relations of time, age, or order; as, at ten o'clock; at twenty-one; at once; at first.

The relations of source, occasion, reason, consequence, or effect; as, at the sight; at this news; merry at anything; at this declaration; at his command; to demand, require, receive, deserve, endure at your hands.

Relation of direction toward an object or end; as, look at it; to point at one; to aim at a mark; to throw, strike, shoot, wink, mock, laugh at any one.

Simple presence or position in, on, near by, or the like; as, at the center; position, state, condition, etc.; as, at dinner; at work, etc.; as, at the beginning.

Denoting presence, nearness, or relation.

Near to; by; in.

On; upon; close to; by; near; in; within.

To; toward; after; by way of; through.

On the happening of; in response to; because of.

Up to; to the extent of; corresponding to.

In; connected with; dependent on; in a state or condition of.

Denotes in general presence or nearness, but less definitely than in or on; also, towards, with, in, on, by, near by, in consequence of.

Near to; with; towards.

prep. [Anglo-Saxon, Gothic, Latin] Primarily, this word expresses the relations of presence, nearness in place or time or direction toward. It denotes the relation of outward situation or of attendant circumstances; –of state or condition; –of employment or action; –of degree; –of occasion, consequence, or effect.

At before a place notes the nearness of the place, as a man is at the house before he is in it; At before a word signifying time, notes the coexistence of the time with the event; At before a superlative adjective implies in the state, as at most, in the state of most perfection, &c. At signifies the particular condition of the person, as at peace; At sometimes marks employment or attention, as he is at work; At sometimes the same with furnished with, as a man at arms; At sometimes notes the place where any thing is, as he is at home; At sometimes is nearly the same as In, noting situation; At sometimes seems to signify in the power of, or obedient to, as at your service; At all, in any manner.