### multiply

• vt. 乘；使增加；使繁殖；使相乘
• vi. 乘；繁殖；增加
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multiply 乘，乘以，繁殖，多倍

multi-,许多，多个，-ply,倍数，词源同imply,comply.引申词义繁殖。

multiply
multiply: [13] Multiply is one of a large family of English words based on Latin multus ‘much’, a word of uncertain origin which may be related to Greek mála ‘very’ and Latin melior ‘better’. Multiply itself comes from the Latin derivative multiplicāre, formed with the element plic- ‘fold’ found also in complicated, explicit, etc, and therefore very closely parallel to the native English compound manifold.

Other members of the family include multiple [17], from late Latin multiplus (the -plus is a relative of the -plic- in multiplicāre); multitude [14], from Latin multitūdō ‘crowd’, formed with the abstract noun suffix -tūdō; and of course the host of words formed since the 16th century with the prefix multi-, including multifarious [17] (based on Latin -fārius ‘doing’), multilateral [17], multinational [20], multiracial [20], and multistorey [20].

=> fold
multiply (v.)
mid-12c., multeplier, "to cause to become many," from Old French multiplier, mouteplier (12c.) "increase, get bigger; flourish; breed; extend, enrich," from Latin multiplicare "to increase," from multiplex (genitive multiplicis) "having many folds, many times as great in number," from comb. form of multus (see multi-) + -plex "-fold," from PIE *plek- "to plait" (see ply (v.1.)). Mathematical sense is attested from late 14c. Related: Multiplied; multiplying.
1. Take the time in seconds, square it, and multiply by 5.12.

2. Take the average of those ratios and multiply by a hundred.

3. The children are already learning to multiply and divide.

4. Think of a number and multiply it by two.

5. When animals have more food, they generally multiply faster.