1. [noun] (now historical) A copy made by the manifold writing process.
2. [noun] (mechanics) A pipe fitting or similar device that connects multiple inputs or outputs.
3. [noun] (US) (regional) (in the plural) The third stomach of a ruminant animal, an omasum.
4. [noun] (mathematics) A topological space that looks locally like the 'ordinary' Euclidean space (mathbb{R}^n) and is Hausdorff.
5. [adjective] Various in kind or quality, diverse
6. [adjective] Many in number, numerous; multiple, multiplied.
7. [adjective] Complicated.
8. [adjective] Exhibited at diverse times or in various ways.
9. [adverb] Many times; repeatedly.
10. [verb] (transitive) To make manifold; multiply.
11. [verb] (transitive) (printing) To multiply or reproduce impressions of by a single operation.
12. [noun] A pipe that has several lateral outlets to or from other pipes.
13. [noun] A lightweight paper used with carbon paper to make multiple copies; 'an original and two manifolds'.
14. [noun] A set of points such as those of a closed surface or an analogue in three or more dimensions.
15. [verb] Make multiple copies of; 'multiply a letter'.
16. [verb] Combine or increase by multiplication; 'He managed to multiply his profits'.
17. [adjective] Many and varied; having many features or forms; 'manifold reasons'; 'our manifold failings'; 'manifold intelligence'; 'the multiplex opportunities in high technology'.
