[trend] 
,| 1. | the general course or prevailing tendency; drift: trends in the teaching of foreign languages; the trend of events. |
| 2. | style; vogue: the new trend in women's apparel. |
| 3. | the general direction followed by a road, river, coastline, or the like. |
| 4. | to have a general tendency, as events, conditions, etc. |
| 5. | to tend to take a particular direction; extend in some direction indicated. |
| 6. | to veer or turn off in a specified direction, as a river, mountain range, etc.: The river trends toward the southeast. |
| trend (trěnd) n.
[From Middle English trenden, to revolve, from Old English trendan.] |
Trend
The general direction of the price of an asset or market. Trends can be thought of in varying lengths including short, intermediate and long term. If one can identify a trend, it can be highly profitable as you will be able to trade with the trend. 
Investopedia Commentary
It is best as a general strategy to trade with trends, meaning if the general trend of the market is headed up be very cautious towards 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.
Related Links
Short-, Intermediate- and Long-Term Trends
Why Do Markets Move?
Trading Trend Or Range?
See also: Asset, Buck the Trend, Market, Technical Analysis, Technically Strong Market, Technically Weak Market, Trend Analysis, Trendline
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