plural of dotted quad

One of the four sections made by dividing an area with two perpendicular lines. / (mathematics) One of the four regions of the Cartesian plane bounded by the x-axis and y-axis.

(music) A tuplet of four notes. / A sequence of four elements. / One of a group of four, particularly one of four babies born from the same mother during the same birth.

A polygon with four sides. / An area defended by four fortresses supporting each other.

Having four sides.

A four-footed or four-legged animal. / A mammal ambulating on all fours.

Being four times as long, as big or as many of something.

(transitive) To multiply by four. / (intransitive) To increase by a factor of four. / (rail transport) To provide four parallel running lines on a given stretch of railway.

Something that is four times the usual number, amount, size, etc. / (skating) A figure-skating jump with four revolutions in the air.

(US, modern British and Australian, short scale) A thousand trillion (logic: 1,000 × 1,000^4): 1 followed by fifteen zeros, 10¹⁵.