The decade of the 1850s, 1950s, etc. / The decade of one's life from age 50 through age 59. / (temperature, rates, plural only) The range between 50 and 59.

plural of fifty

The ordinal form of the number fifty-two, describing a person or thing in position number 52 of a sequence. / Lasting fifty seconds.

One of fifty-four equal parts of a whole.

The ordinal form of the number fifty-three, describing a person or thing in position number 53 of a sequence.

The ordinal form of the number fifty-four, describing a person or thing in position number 54 of a sequence.

One of fifty-five equal parts of a whole.

One of fifty-three equal parts of a whole.

One of fifty-eight equal parts of a whole.

One of fifty-two equal parts of a whole.