A longitudinal strip projecting from an object to strengthen it, or to enter a channel in another object and thereby prevent displacement sideways but permit motion lengthwise; a spline.

Sense（5）

Kind; nature; species (from the proverbial phrase "birds of a feather").

Sense（6）

One of the two shims of the three-piece stone-splitting tool known as plug and feather or plug and feathers; the feathers are placed in a borehole and then a wedge is driven between them, causing the stone to split.

Sense（7）

Sense（8）

Anything petty or trifling; a whit or jot.

To some pew purchasers he gave deeds, to others he gave, none, but both were promised security, and both it seems were equally secure, for the pew deed as Mr. Melledge declared to Mr. G. was not worth a feather.

Google Translation / DeepL Translation

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Sense（9）

(hunting, in the plural) Partridges and pheasants, as opposed to rabbits and hares (called fur).

Sense（10）

(rail transport) A junction indicator attached to a colour-light signal at an angle, which lights up, typically with four white lights in a row, when a diverging route is set up.