[ney-tey-shuh
n, na-] 
| an act or the skill of swimming. |
| na·ta·tion (nā-tā'shən, nā-) n. The act or skill of swimming. [Latin natātiō, natātiōn-, from natātus, past participle of natāre, frequentative of nāre, to swim; see snā- in Indo-European roots.] |