Definitions for "Neap tide"
An especially low tide that occurs when the angle between the direction of the Moon and the direction of the Sun is 90°.
A tide of lower range than an average (“ordinary”) tide due to the sun's and moon's gravitational forces acting on the sea at an angle to each other.
The tides produced when the gravitational pull of the Sun is in quadrature, i.e. at right angles to, with that of the Moon. These occur twice a month at about the times of the first and last quarters. In these situations the gravitational pull of the Sun/Moon produces high/low water or vice-versa, and as such the differences between high and low tides are unusually small, with both the high tide lower and the low tide higher than usual. The tidal height is about .375 that of maximum during neap tides. See also spring tide.