Definition of 'Trend'
The general direction of a market or of the price of an asset. Trends can vary in length from short, to intermediate, to long term. If you can identify a trend, it can be highly profitable, because you will be able to trade with the trend.
Investopedia explains 'Trend'
As a general strategy, it is best to trade with trends, meaning that if the general trend of the market is headed up, you should be very cautious about taking any positions that rely on the trend going in the opposite direction.
A trend can also apply to interest rates, yields, equities and any other market which is characterized by a long-term movement in price or volume.