/pə'ræmɪtə(r); pə`ræmətɚ/
n
1 (mathematics数) quantity that does not vary in a particular case but does vary in other cases 参量; 参数.
2 characteristic or feature, esp one that can be measured or quantified 特点, 特性（尤指可以衡量或计量的）.
3 (usu pl 通常作复数) limiting factor or characteristic; limit （限定性的）因素, 特性; 界限
*We have to work within the parameters of time and budget. 我们工作受时间和财力所限.

n [C usually plural]
[Date: 1600-1700; Language: Modern Latin;Origin: para- ( PARA-) + Greek metron 'measure']
a set of fixed limits that control the way that something should be done
　The inquiry has to stay within the parameters laid down by Congress.