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.

From or evoking the 51st through 60th years of a century (chiefly the 1950s).

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-two equal parts of a whole.

The ordinal form of the number fifty-five, describing a person or thing in position number 55 of a sequence.

One of fifty-five 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.

One of fifty-three equal parts of a whole.

The ordinal form of the number fifty-one, describing a person or thing in position number 51 of a sequence.

One of fifty-one equal parts of a whole.