n.
1.(geology) the deposition of one geological stratum on another
2.(geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest
3.(geometry) the placement of one object ideally in the position of another one in order to show that the two coincide
4.the placement of one thing on top of another
Idiom of the Day
hold one's own (in an argument)
to be able to defend one`s position in an argument
Although the woman's boss is very aggressive she is able to hold her own in any dispute with him.