A region of low atmospheric pressure, especially one in which most of the air has been pumped out.

plural of partial vacuum

(grammar) In some languages, e.g. in Finnish, an object that indicates incomplete action, as opposed to total object that indicates completed action.

(mathematics) Any of several fractions to the sum of which a single fraction is equal.

(mycology) A veil which covers the mushroom gills from the edge of the cap to the stem.

plural of partial function

plural of partial dependency

(chess) A pin where a rook or queen is pinned along a file, or a bishop or queen is pinned along a diagonal.

plural of partial pin

(mathematics) The sum of the first n terms of an infinite series, where n is a finite number.