- 周期性 zhōuqīxìng periodicityperiodicity; cyclicity
- 周期表 zhōuqībiǎo periodic tableperiodic table of the chemical elements; a chart of elements arranged by increasing atomic number so that those with similar properties fall into the same column
- 光周期 guāngzhōuqī photoperiodThe physiological response of organisms to the duration of light and dark periods in a 24-hour cycle.
- 周期定律 zhōuqīdìnglǜ periodic lawscientific law stating that the physical and chemical properties of elements recur in a systematic and predictable way when the elements are arranged in order of increasing atomic number
- 周期律 zhōuqīlǜ periodic lawThe general law that things or objects move or change in regular cycles.
- 周期数 zhōuqīshù periodic number
- 周期系 zhōuqīxì periodic systemthe periodic system of chemical elements; periodicity in chemistry
- 周期解 zhōuqījiě periodic solutiona periodic solution, especially within the context of mathematics
- 开发周期 kāifāzhōuqī development cycleThe amount of time required to complete the development of a product or project; development period
- 生命周期 shēngmìngzhōuqī life cycleThe series of stages through which a living thing passes from its beginning until its death; life cycle.
- 细胞周期 xìbāozhōuqī cell cycleThe series of events that take place in a cell leading to its division and duplication of its DNA
- 元素周期表 yuánsùzhōuqībiǎo periodic tablethe periodic table of the chemical elements
- 经济周期 jīngjìzhōuqī economic cyclethe periodic fluctuations in economic activity, including periods of growth and recession
- 双周期性 shuāngzhōuqīxìng double periodicity(math.) double periodicity
- 反周期 fǎnzhōuqī counter-cyclicalDescribing economic policies or measures used to oppose the natural fluctuations of a business cycle; counter-cyclical; anti-periodic
- 周期函数 zhōuqīhánshù periodic functionA function that repeats its values at regular intervals or periods.
