(astronomy) A constellation that is only above the horizon (and thus visible) for part of the year.

(economics) A type of unemployment explained by a seasonal variation in the structure of jobs and/or labour offered. Seasonal unemployment typically repeats the same pattern annually.

plural of seasonal constellation

(geology) Synonym of intermittent lake

plural of seasonal lake

Synonym of temporal hour

(psychology) Seasonal affective disorder.

Someone who is hired to do work that is only required at a particular time of year, such as harvesting, working as a lifeguard, etc.

At all times.

(psychology) A form of depression associated with the lack of natural light during the winter months.