assumption
[ə'sʌmpʃən] as·sump·tion
n. 假定，设想，担任(职责等), 假装
例句与用法：
1.The project was predicated on the assumption that the economy was expanding.
这一计划是以经济发展的设想为依据的。
2.Their assumptions of an air of confidence fooled nobody.
他们装出信心十足的样子却欺骗不了任何人。
3.The theory is based on a series of wrong assumptions.
这一理论是以一系列错误的设想为依据的。