Ordinal numbers

One suffix does almost all of it

French builds ordinals by adding -ième to the cardinal number you already know. There is no separate word to learn for each one.

cardinalordinal
deuxdeuxièmesecond
troistroisièmethird
sixsixièmesixth
septseptièmeseventh
huithuitièmeeighth
dixdixièmetenth

A final -e is dropped first: quatrequatrième, not quatreième.

Three that change their spelling

why
cinq → cinquièmefiftha u is inserted to keep the /k/ sound
neuf → neuvièmeninththe f becomes v
un → premierfirstcompletely irregular, and carded back at L79

premier is the only ordinal with a separate feminine form you must think about: premier / première. Every ordinal in -ième is identical for both genders — le troisième jour, la troisième fois.

second or deuxième ?

Both mean second. The old rule is that second is used when there are only two of something and deuxième when the list may go on, and while few people apply it strictly any more, second does keep a slightly more formal ring.

It is my second trip.
C'est mon second voyage.

Floors are counted from zero

Le deuxième étage is two flights up, because the ground floor is le rez-de-chaussée and is not counted as a numbered floor at all.

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