"Enneatical" is a word in ENGLISH

Occurring every two hundred years.

Occurring or appearing once every two weeks; fortnightly.

Occurring once in every hundred years; centennial.

Happening or done every hour; occurring hour by hour; frequent; often repeated; renewed hour by hour; continual.

Occurring once in four years, or at the end of every four years; as, quadrennial games.

Of or pertaining to the fourth; occurring every fourth day, reckoning inclusively; as, a quartan ague, or fever.

Occurring once in five years, or at the end of every five years; also, lasting five years. A quinquennial event.

Occurring as the fifth, after four others also, occurring every fifth day, reckoning inclusively; as, a quintan fever.

Pertaining to, or accomplished in, half a day, or twelve hours; occurring twice every day.

The art or process of making a compound by putting the ingredients together, as contrasted with analysis; thus, water is …

Occurring every term; as, a termly fee.

Occurring every third day; as, a tertian fever.

tímpa - Land-slide, land-slip, falling-in, falling-down; to cave in (of a hole or mine); to fall—, slide—, glide—, burst—, dash—, …

Of or pertaining to thirty years; consisting of thirty years; occurring once in every thirty years.

Occurring once in every three hours.

Of or pertaining to a trimester, or period of three months; occurring once in every three months; quarterly.

Occurring once in every period of eleven years; undecennial.

Occurring or observed every eleventh year; belonging to, or continuing, a period of eleven years; undecennary; as, an undecennial festival.