ACT n. 2 definitions
ne or doing; the exercise of power, or the effect, of which power exerted is the cause; a performance; a deed. That best portion of a good man's life, His little, nameless, unremembered acts Of kindness and of love. Wordsworth. Hence, in specific uses:
ALTERNATION n.
in time or place; the act of following and being followed by turns; alternate succession, performance, or occurrence; as, the alternation of day and night, cold and heat, summer and winter, hope and fear.