- watermark
- wa|ter|mark [ˈwo:təma:k US ˈwo:tərma:rk, ˈwa:-] n1.) a special design put onto paper, especially bank notes, that can only be seen when you hold it up to the lightbear/carry a watermark▪ The sheet bears the watermark '1836'.2.) a special mark contained in electronic documents, pictures, music etc that is used to stop people from copying them▪ The card has a digital watermark detectable only to electronic cash dispensers.3.) high watermarkespecially AmE the high watermark of a particular process is its most successful time or achievement= high point high watermark of▪ Reagan's presidency may prove to have been the high watermark of the US-Israeli alliance.4.) high/low watermarkAmE a line showing the highest or lowest levels of the seaBritish Equivalent: tide-mark
Dictionary of contemporary English. 2013.