(roofing) A roof system in which the principal roof covering is a single layer of flexible membrane often thermoset or thermoplastic.

Not singular. / (information theory) Injective.

plural of single bed

plural of single crystal

Even the longest and most difficult ventures have a starting point.

A hypothetical future event in human history caused by the ever-increasing ability of new technology to speed up the rate at which new technology is developed.

Alternative spelling of folksinger, someone who sings folk music.

A quotation mark, as in She said, 'Go ahead'. / An apostrophe, as in Let's do it.

plural of Singapore dollar

The official currency of Singapore.